42 results on '"Bromund, K. R."'
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2. Structure, force balance, and topology of Earth’s magnetopause
- Author
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Russell, C. T., Strangeway, R. J., Zhao, C., Anderson, B. J., Baumjohann, W., Bromund, K. R., Fischer, D., Kepko, L., Le, G., Magnes, W., Nakamura, R., Plaschke, F., Slavin, J. A., Torbert, R. B., Moore, T. E., Paterson, W. R., Pollock, C. J., and Burch, J. L.
- Published
- 2017
3. Two Classes of Equatorial Magnetotail Dipolarization Fronts Observed by Magnetospheric Multiscale Mission : A Statistical Overview
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Alqeeq, S. W., Le Contel, O., Canu, P., Retino, A., Chust, T., Mirioni, L., Chuvatin, A., Nakamura, R., Ahmadi, N., Wilder, F. D., Gershman, D. J., Khotyaintsev, Yuri V., Lindqvist, P. -A, Ergun, R. E., Burch, J. L., Torbert, R. B., Fuselier, S. A., Russell, C. T., Wei, H. Y., Strangeway, R. J., Bromund, K. R., Fischer, D., Giles, B. L., Saito, Y., Alqeeq, S. W., Le Contel, O., Canu, P., Retino, A., Chust, T., Mirioni, L., Chuvatin, A., Nakamura, R., Ahmadi, N., Wilder, F. D., Gershman, D. J., Khotyaintsev, Yuri V., Lindqvist, P. -A, Ergun, R. E., Burch, J. L., Torbert, R. B., Fuselier, S. A., Russell, C. T., Wei, H. Y., Strangeway, R. J., Bromund, K. R., Fischer, D., Giles, B. L., and Saito, Y.
- Abstract
We carried out a statistical study of equatorial dipolarization fronts (DFs) detected by the Magnetospheric Multiscale mission during the full 2017 Earth's magnetotail season. We found that two DF classes are distinguished: class I (74.4%) corresponds to the standard DF properties and energy dissipation and a new class II (25.6%). This new class includes the six DF discussed in Alqeeq et al. (2022, ) and corresponds to a bump of the magnetic field associated with a minimum in the ion and electron pressures and a reversal of the energy conversion process. The possible origin of this second class is discussed. Both DF classes show that the energy conversion process in the spacecraft frame is driven by the diamagnetic current dominated by the ion pressure gradient. In the fluid frame, it is driven by the electron pressure gradient. In addition, we have shown that the energy conversion processes are not homogeneous at the electron scale mostly due to the variations of the electric fields for both DF classes.
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- 2023
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4. The Magnetospheric Multiscale Magnetometers
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Russell, C. T., primary, Anderson, B. J., additional, Baumjohann, W., additional, Bromund, K. R., additional, Dearborn, D., additional, Fischer, D., additional, Le, G., additional, Leinweber, H. K., additional, Leneman, D., additional, Magnes, W., additional, Means, J. D., additional, Moldwin, M. B., additional, Nakamura, R., additional, Pierce, D., additional, Plaschke, F., additional, Rowe, K. M., additional, Slavin, J. A., additional, Strangeway, R. J., additional, Torbert, R., additional, Hagen, C., additional, Jernej, I., additional, Valavanoglou, A., additional, and Richter, I., additional
- Published
- 2016
- Full Text
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5. The Magnetospheric Multiscale Magnetometers
- Author
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Russell, C. T., Anderson, B. J., Baumjohann, W., Bromund, K. R., Dearborn, D., Fischer, D., Le, G., Leinweber, H. K., Leneman, D., Magnes, W., Means, J. D., Moldwin, M. B., Nakamura, R., Pierce, D., Plaschke, F., Rowe, K. M., Slavin, J. A., Strangeway, R. J., Torbert, R., Hagen, C., Jernej, I., Valavanoglou, A., and Richter, I.
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- 2016
- Full Text
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6. Investigation of the homogeneity of energy conversion processes at dipolarization fronts from MMS measurements
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Alqeeq, S. W., Le Contel, O., Canu, P., Retino, A., Chust, T., Mirioni, L., Richard, Louis, Ait-Si-Ahmed, Y., Alexandrova, A., Chuvatin, A., Ahmadi, N., Baraka, S. M., Nakamura, R., Wilder, F. D., Gershman, D. J., Lindqvist, P. A., Khotyaintsev, Yuri V., Ergun, R. E., Burch, J. L., Torbert, R. B., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Wei, H., Plaschke, F., Anderson, B. J., Giles, B. L., Fuselier, S. A., Saito, Y., Lavraud, B., Alqeeq, S. W., Le Contel, O., Canu, P., Retino, A., Chust, T., Mirioni, L., Richard, Louis, Ait-Si-Ahmed, Y., Alexandrova, A., Chuvatin, A., Ahmadi, N., Baraka, S. M., Nakamura, R., Wilder, F. D., Gershman, D. J., Lindqvist, P. A., Khotyaintsev, Yuri V., Ergun, R. E., Burch, J. L., Torbert, R. B., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Wei, H., Plaschke, F., Anderson, B. J., Giles, B. L., Fuselier, S. A., Saito, Y., and Lavraud, B.
- Abstract
We report on six dipolarization fronts (DFs) embedded in fast earthward flows detected by the Magnetospheric Multiscale mission during a substorm event on 23 July 2017. We analyzed Ohm's law for each event and found that ions are mostly decoupled from the magnetic field by Hall fields. However, the electron pressure gradient term is also contributing to the ion decoupling and likely responsible for an electron decoupling at DF. We also analyzed the energy conversion process and found that the energy in the spacecraft frame is transferred from the electromagnetic field to the plasma (J & BULL; E > 0) ahead or at the DF, whereas it is the opposite (J & BULL; E < 0) behind the front. This reversal is mainly due to a local reversal of the cross-tail current indicating a substructure of the DF. In the fluid frame, we found that the energy is mostly transferred from the plasma to the electromagnetic field (J & BULL; E & PRIME; < 0) and should contribute to the deceleration of the fast flow. However, we show that the energy conversion process is not homogeneous at the electron scales due to electric field fluctuations likely related to lower-hybrid drift waves. Our results suggest that the role of DF in the global energy cycle of the magnetosphere still deserves more investigation. In particular, statistical studies on DF are required to be carried out with caution due to these electron scale substructures.
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- 2022
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7. In-Flight Calibration of the MMS Fluxgate Magnetometers
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Bromund, K. R, Plaschke, F, Strangeway, R. J, Anderson, B. J, Huang, B. G, Magnes, W, Fischer, D, Nakamura, R, Leinweber, H. K, Russell, C. T, Baumjohann, W, Chutter, M, Torbert, R. B, Le, G, Slavin, J. A, and Kepko, E. L
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Astrophysics - Abstract
We present an overview of the approach to in-flight calibration, which is a coordinated effort between the University of California Los Angeles (UCLA), Space Research Institute, Graz, Austria (IWF) and the NASA Goddard Space Flight Center (GSFC). We present details of the calibration effort at GSFC. During the first dayside season of the Magnetospheric Multiscale (MMS) mission, the in-flight calibration process for the Fluxgate magnetometers (FGM) implemented an algorithm that selected a constant offset (zero-level) for each sensor on each orbit. This method was generally able to reduce the amplitude of residual spin tone to less than 0.2 nT within the region of interest. However, there are times when the offsets do show significant short-term variations. These variations are most prominent in the nighttime season (phase 1X), when eclipses are accompanied by offset changes as large as 1 nT. Eclipses are followed by a recovery period as long as 12 hours where the offsets continue to change as temperatures stabilize. Understanding and compensating for these changes will become critical during Phase 2 of the mission in 2017, when the nightside will become the focus of MMS science. Although there is no direct correlation between offset and temperature, the offsets are seen for the period of any given week to be well-characterized as function of instrument temperature. Using this property, a new calibration method has been developed that has proven effective in compensating for temperature-dependent offsets during phase 1X of the MMS mission and also promises to further refine calibration quality during the dayside season.
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- 2017
8. Electron Heating at Kinetic Scales in Magnetosheath Turbulence
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Chasapis, Alexandros, Matthaeus, W. H, Parashar, T. N, Lecontel, O, Retino, A, Breuillard, H, Khotyaintsev, Y, Vaivads, A, Lavraud, B, Eriksson, E, Moore, T. E, Burch, J. L, Torbert, R. B, Lindqvist, P.-A, Ergun, R. E, Marklund, G, Goodrich, K. A, Wilder, F. D, Chutter, M, Needell, J, Rau, D, Dors, I, Russell, C. T, Le, G, Magnes, W, Strangeway, R. J, Bromund, K. R, Leinweber, H. K, Plaschke, F, Fischer, D, Anderson, B. J, Pollock, C. J, Giles, B. L, Paterson, W. R, Dorelli, J, Gershman, D. J, Avanov, L, and Saito, Y
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Statistics And Probability ,Astrophysics - Abstract
We present a statistical study of coherent structures at kinetic scales, using data from the Magnetospheric Multiscale mission in the Earths magnetosheath. We implemented the multi-spacecraft partial variance of increments (PVI) technique to detect these structures, which are associated with intermittency at kinetic scales. We examine the properties of the electron heating occurring within such structures. We find that, statistically, structures with a high PVI index are regions of significant electron heating. We also focus on one such structure, a current sheet, which shows some signatures consistent with magnetic reconnection. Strong parallel electron heating coincides with whistler emissions at the edges of the current sheet.
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- 2017
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9. In-Flight Calibration Methods for Temperature-Dependent Offsets in the MMS Fluxgate Magnetometers
- Author
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Bromund, K. R, Plaschke, F, Strangeway, R. J, Anderson, B. J, Huang, B. G, Magnes, W, Fischer, D, Nakamura, R, Leinweber, H. K, Russell, C. T, Baumjohann, W, Chutter, M, Torbert, R. B, Le, G, Slavin, J. A, and Kepko, E. L
- Subjects
Astrophysics - Abstract
During the first dayside season of the Magnetospheric Multiscale (MMS) mission, the in-flight calibration process for the Fluxgate magnetometers (FGM) implemented an algorithm that selected a constant offset (zero-level) for each sensor on each orbit. This method was generally able to reduce the amplitude of residual spin tone to less than 0.2 nT within the region of interest. However, there are times when the offsets do show significant short-term variations. These variations are most prominent in the nighttime season (phase 1X), when eclipses are accompanied by offset changes as large as 1 nT. Eclipses are followed by a recovery period as long as 12 hours where the offsets continue to change as temperatures stabilize. Understanding and compensating for these changes will become critical during Phase 2 of the mission in 2017, when the nightside will become the focus of MMS science. Although there is no direct correlation between offset and temperature, the offsets are seen for the period of any given week to be well-characterized as function of instrument temperature. Using this property, a new calibration method has been developed that has proven effective in compensating for temperature-dependent offsets during phase 1X of the MMS mission and also promises to further refine calibration quality during the dayside season.
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- 2016
10. Force Balance at the Magnetopause Determined with MMS: Application to Flux Transfer Events
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Zhao, C, Russell, C. T, Strangeway, R. J, Petrinec, S. M, Paterson, W. R, Zhou, M, Anderson, B. J, Baumjohann, W, Bromund, K. R, Chutter, M, Fischer, D, Le, G, Nakamura, R, Plaschke, F, Slavin, J. A, Torbert, R. B, and Wei, H. Y
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Astrophysics ,Astrodynamics - Abstract
The Magnetospheric Multiscale mission (MMS) consists of four identical spacecraft forming a closely separated (less than or equal to 10 km) and nearly regular tetrahedron. This configuration enables the decoupling of spatial and temporal variations and allows the calculation of the spatial gradients of plasma and electromagnetic field quantities. We make full use of the well cross-calibrated MMS magnetometers and fast plasma instruments measurements to calculate both the magnetic and plasma forces in flux transfer events (FTEs) and evaluate the relative contributions of different forces to the magnetopause momentum variation. This analysis demonstrates that some but not all FTEs, consistent with previous studies, are indeed force-free structures in which the magnetic pressure force balances the magnetic curvature force. Furthermore, we contrast these events with FTE events that have non-force-free signatures.
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- 2016
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11. Investigation of the homogeneity of energy conversion processes at dipolarization fronts from MMS measurements
- Author
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Alqeeq, S. W., primary, Le Contel, O., additional, Canu, P., additional, Retinò, A., additional, Chust, T., additional, Mirioni, L., additional, Richard, L., additional, Aït-Si-Ahmed, Y., additional, Alexandrova, A., additional, Chuvatin, A., additional, Ahmadi, N., additional, Baraka, S. M., additional, Nakamura, R., additional, Wilder, F. D., additional, Gershman, D. J., additional, Lindqvist, P. A., additional, Khotyaintsev, Yu. V., additional, Ergun, R. E., additional, Burch, J. L., additional, Torbert, R. B., additional, Russell, C. T., additional, Magnes, W., additional, Strangeway, R. J., additional, Bromund, K. R., additional, Wei, H., additional, Plaschke, F., additional, Anderson, B. J., additional, Giles, B. L., additional, Fuselier, S. A., additional, Saito, Y., additional, and Lavraud, B., additional
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- 2022
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12. Steepening of Waves at the Duskside Magnetopause
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Plaschke, F, Kahr, N, Fischer, D, Nakamura, R, Baumjohann, W, Magnes, W, Burch, J. L, Torbert, R, Russell, C. T, Giles, B. L, Bromund, K. R, Le, G, and Kepko, E. L
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Geophysics - Abstract
Surface waves at the magnetopause flanks typically feature steeper, i.e., more inclined leading (antisunward facing) than trailing (sunward facing) edges. This is expected for Kelvin-Helmholtz instability (KHI) amplified waves. Very rarely, during northward interplanetary magnetic field (IMF) conditions, anomalous inverse steepening has been observed. The small-scale tetrahedral configuration of the Magnetospheric Multiscale spacecraft and their high time resolution measurements enable us to routinely ascertain magnetopause boundary inclinations during surface wave passage with high accuracy by four-spacecraft timing analysis. At the dusk flank magnetopause, 77%/23% of the analyzed wave intervals exhibit regular inverse steepening. Inverse steepening happens during northward IMF conditions, as previously reported and, in addition, during intervals of dominant equatorial IMF. Inverse steepening observed under the latter conditions may be due to the absence of KHI or due to instabilities arising from the alignment of flow and magnetic fields in the magnetosheath.
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- 2016
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13. Transient, Small-Scale Field-Aligned Currents in the Plasma Sheet Boundary Layer During Storm Time Substorms
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Nakamura, R, Sergeev, V. A, Baumjohann, W, Plaschke, F, Magnes, W, Fischer, D, Varsani, A, Schmid, D, Nakamura, T. K. M, Russell, C. T, Strangeway, R. J, Leinweber, H. K, Le, G, Bromund, K. R, Pollock, C. J, Giles, B. L, Dorelli, J. C, Gershman, D. J, Paterson, W, Avanov, L. A, Fuselier, S. A, Genestreti, K, Burch, J. L, Torbert, R. B, Chutter, M, Argall, M. R, Anderson, B. J, Lindqvist, P.-A, Marklund, G. T, Khotyaintsev, Y. V, Mauk, B. H, Cohen, I. J, Baker, D. N, Jaynes, A. N, Ergun, R. E, Kepko, E. L, Moore, T. E, and Coffey, V
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Geophysics - Abstract
We report on field-aligned current observations by the four Magnetospheric Multiscale (MMS) spacecraft near the plasma sheet boundary layer (PSBL) during two major substorms on 23 June 2015. Small-scale field-aligned currents were found embedded in fluctuating PSBL flux tubes near the Separatrix region. We resolve, for the first time, short-lived earthward (downward) intense field-aligned current sheets with thicknesses of a few tens of kilometers, which are well below the ion scale, on flux tubes moving equatorward earth ward during outward plasma sheet expansion. They coincide with upward field-aligned electron beams with energies of a few hundred eV. These electrons are most likely due to acceleration associated with a reconnection jet or high-energy ion beam-produced disturbances. The observations highlight coupling of multiscale processes in PSBL as a consequence of magnetotail reconnection.
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- 2016
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14. Wave Telescope Technique for MMS Magnetometer
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Narita, Y, Plaschke, F, Nakamura, R, Baumjojann, W, Magnes, W, Fischer, D, Voros, Z, Torbert, R. B, Russell, C. T, Strangeway, R. J, Bromund, K. R, Le, G, and Kepko, E. L
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Astronomy ,Astrophysics - Abstract
Multipoint measurements are a powerful method in studying wavefields in space plasmas.The wave telescope technique is tested against magnetic field fluctuations in the terrestrial magnetosheath measured by the four Magnetospheric Multiscale (MMS) spacecraft on a spatial scale of about 20 km.The dispersion relation diagram and the wave vector distribution are determined for the first time in the ion-kinetic range. Moreover, the dispersion relation diagram is determined in a proxy plasma restframe by regarding the low-frequency dispersion relation as a Doppler relation and compensating for the apparent phase velocity. Fluctuations are highly compressible, and the wave vectors have an angle of about 60 from the mean magnetic field. We interpret that the measured fluctuations represent akinetic-drift mirror mode in the magnetosheath which is dispersive and in a turbulent state accompanied by a sideband formation.
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- 2016
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15. In-Flight Calibration Processes for the MMS Fluxgate Magnetometers
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Bromund, K. R, Leinweber, H. K, Plaschke, F, Strangeway, R. J, Magnes, W, Fischer, D, Nakamura, R, Anderson, B. J, Russell, C. T, Baumjohann, W, Chutter, M, Torbert, R. B, Le, G, Slavin, J. A, and Kepko, E. L
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Instrumentation And Photography - Abstract
The calibration effort for the Magnetospheric Multiscale Mission (MMS) Analog Fluxgate (AFG) and DigitalFluxgate (DFG) magnetometers is a coordinated effort between three primary institutions: University of California, LosAngeles (UCLA); Space Research Institute, Graz, Austria (IWF); and Goddard Space Flight Center (GSFC). Since thesuccessful deployment of all 8 magnetometers on 17 March 2015, the effort to confirm and update the groundcalibrations has been underway during the MMS commissioning phase. The in-flight calibration processes evaluatetwelve parameters that determine the alignment, orthogonalization, offsets, and gains for all 8 magnetometers usingalgorithms originally developed by UCLA and the Technical University of Braunschweig and tailored to MMS by IWF,UCLA, and GSFC. We focus on the processes run at GSFC to determine the eight parameters associated with spin tonesand harmonics. We will also discuss the processing flow and interchange of parameters between GSFC, IWF, and UCLA.IWF determines the low range spin axis offsets using the Electron Drift Instrument (EDI). UCLA determines the absolutegains and sensor azimuth orientation using Earth field comparisons. We evaluate the performance achieved for MMS andgive examples of the quality of the resulting calibrations.
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- 2015
16. The Magnetospheric Multiscale Magnetometers
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Russell, C. T, Anderson, B. J, Baumjohann, W, Bromund, K. R, Dearborn, D, Fischer, D, Le, G, Leinweber, H. K, Leneman, D, Magnes, W, Means, J. D, Moldwin, M. B, Nakamura, R, Pierce, D, Plaschke, F, Rowe, K. M, Slavin, J. A, Strangeway, R. J, Tobert, R, Hagen, C, Jernej, I, Valavanoglou, A, and Richter, I
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Space Sciences (General) - Abstract
The success of the Magnetospheric Multiscale mission depends on the accurate measurement of the magnetic field on all four spacecraft. To ensure this success, two independently designed and built fluxgate magnetometers were developed, avoiding single-point failures. The magnetometers were dubbed the digital fluxgate (DFG), which uses an ASIC implementation and was supplied by the Space Research Institute of the Austrian Academy of Sciences and the analogue magnetometer (AFG) with a more traditional circuit board design supplied by the University of California, Los Angeles. A stringent magnetic cleanliness program was executed under the supervision of the Johns Hopkins University,s Applied Physics Laboratory. To achieve mission objectives, the calibration determined on the ground will be refined in space to ensure all eight magnetometers are precisely inter-calibrated. Near real-time data plays a key role in the transmission of high-resolution observations stored onboard so rapid processing of the low-resolution data is required. This article describes these instruments, the magnetic cleanliness program, and the instrument pre-launch calibrations, the planned in-flight calibration program, and the information flow that provides the data on the rapid time scale needed for mission success.
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- 2014
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17. Lower Hybrid Drift Waves and Electromagnetic Electron Space-Phase Holes Associated With Dipolarization Fronts and Field-Aligned Currents Observed by the Magnetospheric Multiscale Mission During a Substorm
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Le, Contel O., Breuillard, H., Argall, M. R., Graham, D. B., Fischer, D., Retino, A., Berthomier, M., Pottelette, R., Mirioni, L., Chust, T., Wilder, F. D., Gershman, D. J., Varsani, A., Lindqvist, P. -A., Khotyaintsev, Yu. V., Norgren, C., Ergun, R. E., Goodrich, K. A., Burch, J. L., Torbert, R. B., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Wei, H. Y., Plaschke, F., Anderson, B. J., Le, G., Moore, T. E., Giles, B. L., Paterson, W. R., Pollock, C. J., Dorelli, J. C., Avanov, L. A., Lavraud, B., Fuselier, S. A., Mauk, B. H., Cohen, I. J., Turner, D. L., Fennell, J. F., Leonard, T., Jaynes, A. N., Nakamura, Rumi, and Saito, Yoshifumi
- Abstract
著者人数: 48名, Accepted: 2017-10-10, 資料番号: SA1170207000
- Published
- 2017
18. Whistler Mode Waves and Hall Fields Detected by MMS during a Dayside Magnetopause Crossing
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Le, Contel O., Retino, A., Breuillard, H., Mirioni, L., Robert, P., Chasapis, A., Lavraud, B., Chust, T., Rezeau, L., Wilder, F. D., Graham, D. B., Argall, M. R., Gershman, D. J., Lindqvist, P.-A., Khotyaintsev, Y. V., Marklund, G., Ergun, R. E., Goodrich, K. A., Burch, J. L., Torbert, R. B., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Leinweber, H. K., Plaschke, F., Fischer, D., Anderson, B. J., Le, G., Moore, T. E., Pollock, C. J., Giles, B. L., Dorelli, J. C., Avanov, L., and Saito, Yoshifumi
- Abstract
著者人数: 39名, Accepted: 2016-05-13, 資料番号: SA1160088000
- Published
- 2016
19. Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm time substorms
- Author
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Sergeev, V. A., Baumjohann, W., Plaschke, F., Magnes, W., Fischer, D., Varsani, A., Schmid, D., Nakamura, T. K. M., Russell, C. T., Strangeway, R. J., Leinweber, H. K., Le, G., Bromund, K. R., Pollock, C. J., Giles, B. L., Dorelli, J. C., Gershman, D. J., Paterson, W., Avanov, L. A., Fuselier, S. A., Genestreti, K., Burch, J. L., Torbert, R. B., Chutter, M., Argall, M. R., Anderson, B. J., Lindqvist, P.-A., Marklund, G. T., Khotyaintsev, Y. V., Mauk, B. H., Cohen, I. J., Baker, D. N., Jaynes, A. N., Ergun, R. E., Singer, H. J., Slavin, J. A, Kepko, E. L., Moore, T. E., Lavraud, B., Coffey, V., Nakamura, Rumi, and Saito, Yoshifumi
- Abstract
著者人数: 42名, Accepted: 2016-05-03, 資料番号: SA1160180000
- Published
- 2016
20. The Properties of Lion Roars and Electron Dynamics in Mirror Mode Waves Observed by the Magnetospheric MultiScale Mission
- Author
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Breuillard, H., Le, Contel O., Chust, T., Berthomier, M., Retino, A., Turner, D. L., Nakamura, R., Baumjohann, W., Cozzani, G., Catapano, F., Alexandrova, A., Mirioni, L., Graham, D. B., Argall, M. R., Fischer, D., Wilder, F. D., Gershman, D. J., Varsani, A., Lindqvist, P. -A., Khotyaintsev, Yu. V., Marklund, G., Ergun, R. E., Goodrich, K. A., Ahmadi, N., Burch, J. L., Torbert, R. B., Needell, G., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Wei, H., Plaschke, F., Anderson, B. J., Le, G., Moore, T. E., Giles, B. L., Paterson, W. R., Pollock, C. J., Dorelli, J. C., Avanov, L. A., Lavraud, B., Fuselier, S. A., Mauk, B. H., Cohen, I. J., Fennell, J. F., Saito, Yoshifumi, Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), NASA Goddard Space Flight Center (GSFC), Alfven Laboratory, Royal Institute of Technology [Stockholm] (KTH ), Hokkaido University [Sapporo, Japan], and Fujian Academy of Agricultural Sciences
- Subjects
010504 meteorology & atmospheric sciences ,Wave packet ,wave-particle interaction ,Electron ,01 natural sciences ,Magnetosheath ,Core electron ,Astronomi, astrofysik och kosmologi ,[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,0103 physical sciences ,Astronomy, Astrophysics and Cosmology ,Pitch angle ,Anisotropy ,010303 astronomy & astrophysics ,0105 earth and related environmental sciences ,Physics ,lion roars ,nonlinear waves ,magnetosheath ,Computational physics ,mirror modes ,particle trapping ,Geophysics ,Amplitude ,Space and Planetary Science ,Magnetospheric Multiscale Mission ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
著者人数: 50名, Accepted: 2017-11-21, 資料番号: SA1170269000
- Published
- 2018
21. MMS observations of magnetic reconnection in small-scale current sheets in magnetosheath turbulence
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Chasapis, A., Matthaeus, W. H., Parashar, T., Le Contel, Olivier, Retinò, Alessandro, Breuillard, Hugo, Khotyaintsev, Y. V., Vaivads, A., Lavraud, B., Moore, T. E., Burch, J. L., Torbert, R. B., Lindqvist, P. A., Ergun, R., Marklund, G. T., Goodrich, K. A., Wilder, F. D., Chutter, M., Needell, J., Rau, D., Dors, I., Russell, C., Le, G., Magnes, W., Strangeway, R. J., Bromund, K. R., Leinweber, H. K., Plaschke, F., Fischer, D., Anderson, B. J., Pollock, C., Giles, B. L., Paterson, W. R., Dorelli, J. C., Gershman, D. J., Avanov, L. A., Saito, Y., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Swedish Institute of Space Physics [Uppsala] (IRF), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), and Royal Institute of Technology [Stockholm] (KTH )
- Subjects
Physics::Fluid Dynamics ,[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; Magnetic reconnection occurs in thin current sheets that form in turbulent plasmas. It leads to particle heating and acceleration and is thought to play an important role for the turbulent dissipation at kinetic scales, energy. However, in situ observations are scarce and the extent of its contribution to turbulent dissipation has yet to be determined. The MMS mission allows us to closely study kinetic-scale intermittent structures that form in turbulent plasma as well as to detect thin reconnecting current sheets and examine their properties. We present the results of MMS observations in the turbulence of the Earth's magnetosheath. We performed a statistical study of small-scale intermittent structures and their role in heating and accelerating electrons. We examined one current sheet in detail which shows evidence of reconnection, focusing on the mechanisms that drive the observed heating and acceleration within it and the role of wave-particle interactions.
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- 2016
22. Lower Hybrid Drift Waves and Electromagnetic Electron Space-Phase Holes Associated With Dipolarization Fronts and Field-Aligned Currents Observed by the Magnetospheric Multiscale Mission During a Substorm
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Le Contel, O., Nakamura, R., Breuillard, H., Argall, M. R., Graham, Daniel B., Fischer, D., Retino, A., Berthomier, M., Pottelette, R., Mirioni, L., Chust, T., Wilder, F. D., Gershman, D. J., Varsani, A., Lindqvist, P. -A, Khotyaintsev, Yuri V., Norgren, Cecilia, Ergun, R. E., Goodrich, K. A., Burch, J. L., Torbert, R. B., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Wei, H. Y., Plaschke, F., Anderson, B. J., Le, G., Moore, T. E., Giles, B. L., Paterson, W. R., Pollock, C. J., Dorelli, J. C., Avanov, L. A., Saito, Y., Lavraud, B., Fuselier, S. A., Mauk, B. H., Cohen, I. J., Turner, D. L., Fennell, J. F., Leonard, T., Jaynes, A. N., Le Contel, O., Nakamura, R., Breuillard, H., Argall, M. R., Graham, Daniel B., Fischer, D., Retino, A., Berthomier, M., Pottelette, R., Mirioni, L., Chust, T., Wilder, F. D., Gershman, D. J., Varsani, A., Lindqvist, P. -A, Khotyaintsev, Yuri V., Norgren, Cecilia, Ergun, R. E., Goodrich, K. A., Burch, J. L., Torbert, R. B., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Wei, H. Y., Plaschke, F., Anderson, B. J., Le, G., Moore, T. E., Giles, B. L., Paterson, W. R., Pollock, C. J., Dorelli, J. C., Avanov, L. A., Saito, Y., Lavraud, B., Fuselier, S. A., Mauk, B. H., Cohen, I. J., Turner, D. L., Fennell, J. F., Leonard, T., and Jaynes, A. N.
- Abstract
We analyze two ion scale dipolarization fronts associated with field-aligned currents detected by the Magnetospheric Multiscale mission during a large substorm on 10 August 2016. The first event corresponds to a fast dawnward flow with an antiparallel current and could be generated by the wake of a previous fast earthward flow. It is associated with intense lower hybrid drift waves detected at the front and propagating dawnward with a perpendicular phase speed close to the electric drift and the ion thermal velocity. The second event corresponds to a flow reversal: from southwward/dawnward to northward/duskward associated with a parallel current consistent with a brief expansion of the plasma sheet before the front crossing and with a smaller lower hybrid drift wave activity. Electromagnetic electron phase-space holes are detected near these low-frequency drift waves during both events. The drift waves could accelerate electrons parallel to the magnetic field and produce the parallel electron drift needed to generate the electron holes. Yet we cannot rule out the possibility that the drift waves are produced by the antiparallel current associated with the fast flows, leaving the source for the electron holes unexplained.
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- 2017
- Full Text
- View/download PDF
23. Electron Heating at Kinetic Scales in Magnetosheath Turbulence
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Chasapis, A., Matthaeus, W. H., Parashar, T. N., Lecontel, O., Retinò, A., Breuillard, H., Khotyaintsev, Y., Vaivads, Andris, Lavraud, B., Eriksson, E., Moore, T. E., Burch, J. L., Torbert, R. B., Lindqvist, Per-Arne, Ergun, R. E., Marklund, Göran, Goodrich, K. A., Wilder, F. D., Chutter, M., Needell, J., Rau, D., Dors, I., Russell, C. T., Le, G., Magnes, W., Strangeway, R. J., Bromund, K. R., Leinweber, H. K., Plaschke, F., Fischer, D., Anderson, B. J., Pollock, C. J., Giles, B. L., Paterson, W. R., Dorelli, J., Gershman, D. J., Avanov, L., Saito, Y., Chasapis, A., Matthaeus, W. H., Parashar, T. N., Lecontel, O., Retinò, A., Breuillard, H., Khotyaintsev, Y., Vaivads, Andris, Lavraud, B., Eriksson, E., Moore, T. E., Burch, J. L., Torbert, R. B., Lindqvist, Per-Arne, Ergun, R. E., Marklund, Göran, Goodrich, K. A., Wilder, F. D., Chutter, M., Needell, J., Rau, D., Dors, I., Russell, C. T., Le, G., Magnes, W., Strangeway, R. J., Bromund, K. R., Leinweber, H. K., Plaschke, F., Fischer, D., Anderson, B. J., Pollock, C. J., Giles, B. L., Paterson, W. R., Dorelli, J., Gershman, D. J., Avanov, L., and Saito, Y.
- Abstract
We present a statistical study of coherent structures at kinetic scales, using data from the Magnetospheric Multiscale mission in the Earth's magnetosheath. We implemented the multi-spacecraft partial variance of increments (PVI) technique to detect these structures, which are associated with intermittency at kinetic scales. We examine the properties of the electron heating occurring within such structures. We find that, statistically, structures with a high PVI index are regions of significant electron heating. We also focus on one such structure, a current sheet, which shows some signatures consistent with magnetic reconnection. Strong parallel electron heating coincides with whistler emissions at the edges of the current sheet., QC 2017-06-08
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- 2017
- Full Text
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24. Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm time substorms
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Nakamura, Rumi, Sergeev, V. A., Baumjohann, W., Plaschke, F., Magnes, W., Fischer, D., Varsani, A., Schmid, D., Nakamura, T. K. M., Russell, C. T., Strangeway, R. J., Leinweber, H. K., Le, G., Bromund, K. R., Pollock, C. J., Giles, B. L., Dorelli, J. C., Gershman, D. J., Paterson, W., Avanov, L. A., Fuselier, S. A., Genestreti, K., Burch, J. L., Torbert, R. B., Chutter, M., Argall, M. R., Anderson, B. J., Lindqvist, P.-A., Marklund, G. T., Khotyaintsev, Y. V., Mauk, B. H., Cohen, I. J., Baker, D. N., Jaynes, A. N., Ergun, R. E., Singer, H. J., Slavin, J. A, Kepko, E. L., Moore, T. E., Lavraud, B., Coffey, V., Saito, Yoshifumi, 中村, るみ, 齋藤, 義文, Nakamura, Rumi, Sergeev, V. A., Baumjohann, W., Plaschke, F., Magnes, W., Fischer, D., Varsani, A., Schmid, D., Nakamura, T. K. M., Russell, C. T., Strangeway, R. J., Leinweber, H. K., Le, G., Bromund, K. R., Pollock, C. J., Giles, B. L., Dorelli, J. C., Gershman, D. J., Paterson, W., Avanov, L. A., Fuselier, S. A., Genestreti, K., Burch, J. L., Torbert, R. B., Chutter, M., Argall, M. R., Anderson, B. J., Lindqvist, P.-A., Marklund, G. T., Khotyaintsev, Y. V., Mauk, B. H., Cohen, I. J., Baker, D. N., Jaynes, A. N., Ergun, R. E., Singer, H. J., Slavin, J. A, Kepko, E. L., Moore, T. E., Lavraud, B., Coffey, V., Saito, Yoshifumi, 中村, るみ, and 齋藤, 義文
- Abstract
著者人数: 42名, Accepted: 2016-05-03
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- 2017
25. Multispacecraft analysis of dipolarization fronts and associated whistler wave emissions using MMS data
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Breuillard, Hugo, Le Contel, Olivier, Retinò, Alessandro, Chasapis, A., Chust, Thomas, Mirioni, Laurent, Graham, D. B., Wilder, F. D., Cohen, I., Vaivads, A., Khotyaintsev, Y. V., Lindqvist, P.-A., Marklund, G. T., Burch, J. L., Torbert, R. B., Ergun, R. E., Goodrich, K. A., Macri, J., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Plaschke, F., Fischer, D., Leinweber, H. K., Anderson, B. J., Le, G., Slavin, J. A., Kepko, E. L., Baumjohann, W., Mauk, B., Fuselier, S. A., Nakamura, R., Laboratoire de Physique des Plasmas (LPP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
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[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; Dipolarization fronts (DFs), embedded in bursty bulk flows, play a crucial role in Earth's plasma sheet dynamics because the energy input from the solar wind is partly dissipated in their vicinity. This dissipation is in the form of strong low-frequency waves that can heat and accelerate energetic electrons up to the high-latitude plasma sheet. However, the dynamics of DF propagation and associated low-frequency waves in the magnetotail are still under debate due to instrumental limitations and spacecraft separation distances. In May 2015 the Magnetospheric Multiscale (MMS) mission was in a string-of-pearls configuration with an average intersatellite distance of 160 km, which allows us to study in detail the microphysics of DFs. Thus, in this letter we employ MMS data to investigate the properties of dipolarization fronts propagating earthward and associated whistler mode wave emissions. We show that the spatial dynamics of DFs are below the ion gyroradius scale in this region (500 km), which can modify the dynamics of ions in the vicinity of the DF (e.g., making their motion nonadiabatic). We also show that whistler wave dynamics have a temporal scale of the order of the ion gyroperiod (a few seconds), indicating that the perpendicular temperature anisotropy can vary on such time scales.
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- 2016
26. Energy Dissipation and Transport Associated with Whistler-wave Generation during Plasma Jet Events using MMS Data
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Breuillard, Hugo, Le Contel, Olivier, Retinò, Alessandro, Russell, C., Baumjohann, W., Mirioni, Laurent, Khotyaintsev, Y. V., Burch, J. L., Torbert, R. B., Ergun, R. E., Anderson, B. J., Needell, J., Chutter, M., Rau, D., Dors, I., Magnes, W., Strangeway, R. J., Bromund, K. R., Plaschke, F., Fischer, D., Leinweber, H. K., Kepko, L., Slavin, J. A., Pollock, C. J., Lindqvist, P. A., Marklund, G. T., Mauk, B., Fuselier, S. A., Le, G., Goodrich, K. A., Macri, J., Vaivads, A., Graham, D. B., Nakamura, R., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Swedish Institute of Space Physics [Uppsala] (IRF), and Royal Institute of Technology [Stockholm] (KTH )
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Astrophysics::High Energy Astrophysical Phenomena ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; Plasma jets aka bursty bulk flows play a crucial role in Earth's magnetosphere dynamics, in particular during substorms where they can penetrate down to the geosynchronous orbit. The energy input from the solar wind is partly dissipated in jet fronts (also called dipolarization fronts) in the form of strong whistler waves that can heat and accelerate energetic electrons. The ratio of the energy transported during jets to the substorm energy consumption can reach one third or more due to kinetic-scale phenomena, that are still under debate due to instrumental limitations. The recently-launched Magnetospheric Multiscale (MMS) mission has already detected numerous plasma jet events, and evolves in a tetrahedral configuration (with an average inter- satellite distance of 160 km and unprecedent resolutions up to 16,000 samples/s) that allows to study in detail the microphysics of these phenomena. Thus in this study we employ MMS data to investigate the energy dissipated in jet fronts related to the generation of whistler waves, and the interaction of such waves with energetic electrons in the vicinity of the flow/jet braking region near the equatorial boundary between tail and inner magnetosphere. We also make use of ray tracing simulations to evaluate their propagation properties, as well as their impact on particles in the off-equatorial magnetosphere.
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- 2015
27. First MMS Observations of High Time Resolution 3D Electric and Magnetic fields at the Dayside Magnetopause
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Torbert, R. B., Burch, J. L., Russell, C. T., Magnes, W., Ergun, R. E., Lindqvist, P. A., Le Contel, Olivier, Vaith, H., Macri, J., Myers, S., Rau, D., Needell, J., King, B., Granoff, M., Chutter, M., Dors, I., Argall, M. R., Shuster, J. R., Olsson, G., Marklund, G. T., Khotyaintsev, Y. V., Eriksson, A. I., Kletzing, C., Bounds, S. R., Anderson, B. J., Baumjohann, W., Steller, M., Bromund, K. R., Le, G., Nakamura, R., Strangeway, R. J., Leinweber, H. K., Tucker, S., Westfall, J., Fischer, D., Plaschke, F., Pollock, C. J., Giles, B. L., Moore, T. E., Mauk, B., Fuselier, S. A., Royal Institute of Technology [Stockholm] (KTH ), Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), University of New Hampshire (UNH), Swedish Institute of Space Physics [Uppsala] (IRF), Department of Physics and Astronomy [Iowa City], University of Iowa [Iowa City], Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), and University of Colorado [Boulder]
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; The electrodynamics at the magnetopause is key to our understanding of ion and electron acceleration within reconnection regions. The Magnetospheric Multiscale (MMS) fleet of four spacecraft was launched into its Phase-1 equatorial orbit of 12 Re apogee specifically to investigate these regions at the Earth's magnetopause. In addition to a comprehensive suite of particle measurements, MMS makes very high time resolution 3D electric and magnetic field measurements of high accuracy using flux-gate, search coil, 3-axis double probe, and electron drift sensors. In September 2015, the MMS fleet will begin to encounter the dusk-side magnetopause in its initial configuration of approximately 160 km separation, allowing investigation of the spatial and temporal characteristics of important electrodynamics during reconnection. Using these field and particle measurements, we present first observations of 3D magnetic and electric fields (including their parallel component), and inferred current sheets, during active magnetopause crossings using the highest time resolution data available on MMS.
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- 2015
28. Electrodynamic Context of Magnetotail and Magnetopause Dynamics Observed by Magnetospheric Multiscal
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Anderson, B. J., Korth, H., Waters, C. L., Barnes, R. J., Samara, M., Russell, C. T., Strangeway, R. J., Plaschke, F., Magnes, W., Fischer, D., Merkin, V. G., Nakamura, R., Baumjohann, W., Torbert, R. B., Leinweber, H. K., Le, G., Bromund, K. R., Chutter, M., Slavin, J. A., Kepko, L., Le Contel, Olivier, Mauk, B., Westlake, J. H., Gjerloev, J. W., Ruohoniemi, J. M., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
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[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; After successful launch and deployment on 14 March 2015, the four Magnetosphere Multiscale (MMS) spacecraft were commissioned during the first local time precession of the orbit line of apsides across the magnetotail from dawn to dusk. Prime science observations began in September 2015 when orbit apogee had moved to the dusk sector at magnetopause distances. Signatures of magnetotail dynamics were observed during payload and fleet commissioning. The electrodynamic context of the magnetotail events at MMS as well as observations at the dusk and afternoon magnetopause is assessed using correlative observations from low Earth orbit and ground-based instruments including the Active Magnetosphere and Polar Electrodynamics Response Experiment (AMPERE), SuperMAG, and SuperDARN. Substorm current onsets are prevalent in AMPERE data and are highly correlated with magnetotail injections and dipolarizations observed by MMS. To better constrain how the MMS magnetotail observations are related to global processes, we also examine the occurrence and prevalence of similar ionospheric onset signatures when MMS was at high altitudes in the magnetotail but observed no local signatures of injections or dipolarizations. For MMS magnetopause observations, we explore the relationship of magnetic reconnection signatures at MMS with the convection patterns derived from AMPERE and ionosphere observations to establish the relationship of the local MMS observations and global magnetospheric convective state.
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- 2015
29. MMS Spacecraft Observation of Near Tail Thin Current Sheets: Their Locations, Conditions for Formation and Relation to Geomagnetic Activity
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Zhao, C., Russell, C. T., Strangeway, R. J., Anderson, B. J., Baumjohann, W., Bromund, K. R., Chutter, M., Fischer, D., Kepko, L., Le Contel, Olivier, Leinweber, H. K., Magnes, W., Nakamura, R., Plaschke, F., Slavin, J. A., Torbert, R. B., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; During the commissioning phase of the MMS mission, when the apogee (~12Re) of MMS orbit swept from the pre-midnight to the dusk section of the magnetosphere, the four spacecraft probed the dynamic region of the near-Earth magnetotail. The MMS fleet encountered many structures with unambiguously small-scale spatial gradient in magnetic field (comparable to the separation of the fleet), indicating the existence of very thin current sheets in this near-tail region. During this commissioning phase, the MMS spacecraft were in a string of pearls configuration, not ideally suitable for "curlometer" determination of the current density. Thus the current density and thickness of the sheets are only roughly determined using reasonable assumptions. In this study we correlate the current sheet's location and thickness with solar wind conditions and the ground magnetic field records.
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- 2015
30. Parallel Electric Fields and Wave Phenomena Associated with Magnetic Reconnection: The Merged Magnetic Field Product from MMS
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Argall, M. R., Torbert, R. B., Le Contel, Olivier, Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Lindqvist, P. A., Marklund, G. T., Ergun, R. E., Khotyaintsev, Y. V., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Royal Institute of Technology [Stockholm] (KTH ), and Swedish Institute of Space Physics [Uppsala] (IRF)
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; Kinetic processes associated with magnetic reconnection current structures are able to be resolved for the first time by the instrument suites and small inter-spacecraft separation of MMS. Measurements of the parallel electric fields responsible for electron acceleration, and wave activity associated with reconnection onset and electron scattering require precise knowledge of the magnetic field amplitude and phase. The fluxgate and searchcoil magnetometers on MMS are sensitive to low- and high-frequency field fluctuations, respectively. In the middle frequency range, we optimize sensitivity by merging the two datasets to create a single magnetic field data product. We analyze frequency-dependent amplitude and phase relationships between the two instruments to determine how they should be joined. The result is a product with the time resolution and Nyquist frequency of the searchcoil, but with the fluxgate's ability to measure the DC magnetic field. This dataset provides improved phase information suitable for determining parallel electric fields during magnetic reconnection events. Its enhanced sensitivity also makes it ideal for resolving thin current layers and uncovering low-amplitude wave activity, such as EMIC waves related to substorm injections and Alfven or lower hybrid waves related to reconnection.
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- 2015
31. Search Coil and Fluxgate Data Merging on MMS: Examples on Dipolarization Event Cases
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Plaschke, F., Fischer, D., Magnes, W., Valavanoglou, A., Le Contel, Olivier, Nakamura, R., Andriopoulou, M., Schmid, D., Baumjohann, W., Torbert, R. B., Russell, C., Strangeway, R. J., Leinweber, H. K., Bromund, K. R., Anderson, B. J., Le, G., Chutter, M., Needell, J., Dors, I., Slavin, J. A., Kepko, L., Mirioni, Laurent, Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; The instrument suite of MMS mission includes one search coil and two fluxgate magnetometers on each observatory and can therefore provide the possibility to study events that cross the sensitive frequency range of both instrument types. It is therefore desirable to have a common merged data product that combines the best parts of both instruments. Extensive ground based test measurements have been performed to identify the properties of the instruments. New models for compensating time and frequency properties were created and the difference to existing calibrations is analyzed. Considerations for application as well as signal processing constraints are discussed and the resulting method is applied on data from the mission. Dipolarization events can serve as suitable example, since they contain a variety of disturbances with different characteristic scales: transient filamentary properties, sharp fronts, reconfiguration of the current sheet, wave signatures on kinetic as well as fluid scales, thus requiring highest sensitivity data in a wide frequency range. We show these different signatures relevant to the dipolarization events based on the analysis of these newly produced data.
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- 2015
32. An MMS multicase study of magnetotail dipolarization fronts
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Schmid, D., Nakamura, R., Plaschke, F., Volwerk, M., Narita, Y., Baumjohann, W., Magnes, W., Fischer, D., Torbert, R. B., Russell, C. T., Strangeway, R. J., Leinweber, H. K., Bromund, K. R., Anderson, B. J., Le, G., Chutter, M., Slavin, J. A., Kepko, L., Moldwin, M., Le Contel, Olivier, Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; Dipolarization fronts (DFs) are characterized by a rapid increase in the northward magnetic field component (Bz) and play a crucial role in the energy and magnetic flux transport in the magnetotail. Multispacecraft observations of DFs in a large portion of the magnetotail by e.g. Geotail, Cluster and THEMIS have been reported for over three decades.During the commissioning phase of MMS we are able to observe DFs at radial distances within 8 Re, which is in a more dipolarized region (well within the flow braking region). We present a statistical study of DFs observed during March-May 2015, using only magnetic field data. First results indicate that the amplitude of the found DFs is greater compared to similar events in the distant tail. Timing analysis yields that many of the DFs propagate tailward, which would suggest a rebound (bouncing) of the DF at the magnetic dipole-dominated near-Earth plasma sheet. Since MMS spacecraft are in a "string-of-pearls" configuration, further analysis is ongoing to evaluate the obtained direction from a simple timing analysis. We compare and contrast the found DFs with that from the DF-eventlist introduced in Schmid et al. [J. Geophys. Res., 2, 120 (2015)], which is based on 9 years (2001-2009) of Cluster magnetotail observations.
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- 2015
33. Magnetospheric Multiscale Observations of Ultra Low Frequency Waves in the Inner Magnetosphere
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Strangeway, R. J., Russell, C. T., Burch, J. L., Torbert, R. B., Magnes, W., Plaschke, F., Leinweber, H. K., Bromund, K. R., Fischer, D., Anderson, B. J., Le, G., Chutter, M., Slavin, J. A., Kepko, L., Le Contel, Olivier, Nakamura, R., Baumjohann, W., Argall, M. R., Chi, P. J., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
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[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,Astrophysics::Earth and Planetary Astrophysics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; The apogee of the Magnetospheric Multiscale (MMS) spacecraft was in the predawn local time sector early in the MMS commissioning phase. On several orbits in this phase MMS observed large amplitude (10s of nT) Pc5 pulsations, typically around 5 to 7 Earth radii, near dawn. Because MMS was in a string-of-pearls configuration we could determine the phase velocity of the waves along the spacecraft separation vector. Preliminary analysis indicates that this was of the order 30-50 km/s, much larger than the spacecraft velocity. Furthermore, the waves are propagating tailwards. Given a nominal wave period of the order 5 minutes, the wavelength of the waves is around 2 Earth radii, assuming azimuthal propagation. This corresponds to an m-number of about 20. The waves used for this initial study were observed on several successive orbits during the recovery phase of the March 17, 2015 geomagnetic storm. We will present additional analysis of the properties of these ULF waves as observed during the MMS commissioning phase, during which time the spacecraft apogee migrated from dawn to dusk through the nightside.
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- 2015
34. Effect of electron ambient plasmas in reconnection jets and dipolarization fronts : MMS initial results
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Nakamura, R., Torkar, K., Andriopoulou, M., Jeszenszky, H., Plaschke, F., Baumjohann, W., Magnes, W., Fischer, D., Schmid, D., Steller, M., Nakamura, T., Scharlemann, C., Torbert, R. B., Burch, J. L., Ergun, R. E., Lindqvist, P. A., Marklund, G. T., Khotyaintsev, Y. V., Russell, C. T., Strangeway, R. J., Leinweber, H. K., Anderson, B. J., Le, G., Bromund, K. R., Fuselier, S. A., Chutter, M., Slavin, J. A., Kepko, L., Le Contel, Olivier, Pollock, C. J., Dorelli, J. C., Gershman, D. J., Mauk, B., Vaith, H., Kletzing, C., Bounds, S. R., Sigsbee, K. M., Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], Alfven Laboratory, Royal Institute of Technology [Stockholm] (KTH ), Swedish Institute of Space Physics [Kiruna] (IRF), NASA Goddard Space Flight Center (GSFC), Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
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[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; With the successful launch of Magnetospheric Multiscale Misssion (MMS), it becomes possible to observe the dynamic signatures of magnetospheric transients with high-time resolution measurements of electromagnetic fields and plasma. The Active Spacecraft Potential Control (ASPOC) neutralizes the spacecraft potential by releasing positive charge produced by indium and thereby controlling the spacecraft potential in order to enable accurate measurements also in sparse plasma environments essential to study properties of reconnection. Since the current balance around the spacecraft is maintained by contribution also from the ambient plasma, predominantly electrons, ASPOC beam current values combined with spacecraft potential data from FIELDS instruments enable to deduce the ambient electron plasma parameters . Particularly, using data from multi-spacecraft measurements with different ASPOC current levels and FIELDS data, parameters on ambient electron temperature and density can be deduced. Monitoring the environmental plasma parameters are essential to determine the accurate scales of the structure or wave length relative to plasma scales and hence to understand the physical processes. In this study we investigate the changes of the electron parameters in the transient structures such as the magnetic field disturbance forming at the front of BBF/flow bursts, called dipolarization front (DF), and reconnection jets in thin current sheets obtained by MMS mainly during the commissioning phase when the spacecraft traversed the near-Earth tail.
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- 2015
35. MMS observations of small magnetic flux ropes in the near-tail (X > -11 Re)
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Slavin, J. A., Poh, G., Le, G., Strangeway, R. J., Russell, C. T., Anderson, B. J., Fischer, D., Plaschke, F., Bromund, K. R., Leinweber, H. K., Kepko, L., Chutter, M., Le Contel, Olivier, Torbert, R. B., Nakamura, R., Magnes, W., Baumjohann, W., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
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[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,Astrophysics::Solar and Stellar Astrophysics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; Magnetic reconnection is the most important energy conversion process in the Earth's magnetotail. Flux ropes are helical magnetic structures created by multiple X-line reconnection in the tail current sheet in the presence of a guide field in the east - west direction. Many numerical simulations predict that the formation of small flux ropes, referred to as secondary islands, takes place as reconnection transitions from the slow Sweet-Parker mode to fast reconnection with inertial scale neutral points. High time resolution MMS magnetic and electric fields measurements are near ideal for the investigation of secondary island - type flux ropes carried Earthward from downstream reconnnection sites, as well as their interaction with the strong dipolar magnetic fields of the inner magnetosphere. We present and analyze initial MMS magnetic field measurements of small flux ropes in the near-tail during the commissioning phase while the spacecraft were in a "string-of-pearls" configuration.
- Published
- 2015
36. Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm time substorms
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Nakamura, R., Sergeev, V. A., Baumjohann, W., Plaschke, F., Magnes, W., Fischer, D., Varsani, A., Schmid, D., Nakamura, T. K. M., Russell, C. T., Strangeway, R. J., Leinweber, H. K., Le, G., Bromund, K. R., Pollock, C. J., Giles, B. L., Dorelli, J. C., Gershman, D. J., Paterson, W., Avanov, L. A., Fuselier, S. A., Genestreti, K., Burch, J. L., Torbert, R. B., Chutter, M., Argall, M. R., Anderson, B. J., Lindqvist, Per-Arne, Marklund, Göran T., Khotyaintsev, Y. V., Mauk, B. H., Cohen, I. J., Baker, D. N., Jaynes, A. N., Ergun, R. E., Singer, H. J., Slavin, J. A., Kepko, E. L., Moore, T. E., Lavraud, B., Coffey, V., Saito, Y., Nakamura, R., Sergeev, V. A., Baumjohann, W., Plaschke, F., Magnes, W., Fischer, D., Varsani, A., Schmid, D., Nakamura, T. K. M., Russell, C. T., Strangeway, R. J., Leinweber, H. K., Le, G., Bromund, K. R., Pollock, C. J., Giles, B. L., Dorelli, J. C., Gershman, D. J., Paterson, W., Avanov, L. A., Fuselier, S. A., Genestreti, K., Burch, J. L., Torbert, R. B., Chutter, M., Argall, M. R., Anderson, B. J., Lindqvist, Per-Arne, Marklund, Göran T., Khotyaintsev, Y. V., Mauk, B. H., Cohen, I. J., Baker, D. N., Jaynes, A. N., Ergun, R. E., Singer, H. J., Slavin, J. A., Kepko, E. L., Moore, T. E., Lavraud, B., Coffey, V., and Saito, Y.
- Abstract
We report on field-aligned current observations by the four Magnetospheric Multiscale (MMS) spacecraft near the plasma sheet boundary layer (PSBL) during two major substorms on 23 June 2015. Small-scale field-aligned currents were found embedded in fluctuating PSBL flux tubes near the separatrix region. We resolve, for the first time, short-lived earthward (downward) intense field-aligned current sheets with thicknesses of a few tens of kilometers, which are well below the ion scale, on flux tubes moving equatorward/earthward during outward plasma sheet expansion. They coincide with upward field-aligned electron beams with energies of a few hundred eV. These electrons are most likely due to acceleration associated with a reconnection jet or high-energy ion beam-produced disturbances. The observations highlight coupling of multiscale processes in PSBL as a consequence of magnetotail reconnection., QC 20160719
- Published
- 2016
- Full Text
- View/download PDF
37. Multispacecraft analysis of dipolarization fronts and associated whistler wave emissions using MMS data
- Author
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Breuillard, H., Le Contel, O., Retino, A., Chasapis, A., Chust, T., Mirioni, L., Graham, D. B., Wilder, F. D., Cohen, I., Vaivads, Andris, Khotyaintsev, Yu V., Lindqvist, Per-Arne, Marklund, Göran T., Burch, J. L., Torbert, R. B., Ergun, R. E., Goodrich, K. A., Macri, J., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Plaschke, F., Fischer, D., Leinweber, H. K., Anderson, B. J., Le, G., Slavin, J. A., Kepko, E. L., Baumjohann, W., Mauk, B., Fuselier, S. A., Nakamura, R., Breuillard, H., Le Contel, O., Retino, A., Chasapis, A., Chust, T., Mirioni, L., Graham, D. B., Wilder, F. D., Cohen, I., Vaivads, Andris, Khotyaintsev, Yu V., Lindqvist, Per-Arne, Marklund, Göran T., Burch, J. L., Torbert, R. B., Ergun, R. E., Goodrich, K. A., Macri, J., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Plaschke, F., Fischer, D., Leinweber, H. K., Anderson, B. J., Le, G., Slavin, J. A., Kepko, E. L., Baumjohann, W., Mauk, B., Fuselier, S. A., and Nakamura, R.
- Abstract
Dipolarization fronts (DFs), embedded in bursty bulk flows, play a crucial role in Earth's plasma sheet dynamics because the energy input from the solar wind is partly dissipated in their vicinity. This dissipation is in the form of strong low-frequency waves that can heat and accelerate energetic electrons up to the high-latitude plasma sheet. However, the dynamics of DF propagation and associated low-frequency waves in the magnetotail are still under debate due to instrumental limitations and spacecraft separation distances. In May 2015 the Magnetospheric Multiscale (MMS) mission was in a string-of-pearls configuration with an average intersatellite distance of 160km, which allows us to study in detail the microphysics of DFs. Thus, in this letter we employ MMS data to investigate the properties of dipolarization fronts propagating earthward and associated whistler mode wave emissions. We show that the spatial dynamics of DFs are below the ion gyroradius scale in this region (approximate to 500km), which can modify the dynamics of ions in the vicinity of the DF (e.g., making their motion nonadiabatic). We also show that whistler wave dynamics have a temporal scale of the order of the ion gyroperiod (a few seconds), indicating that the perpendicular temperature anisotropy can vary on such time scales., QC 20161014
- Published
- 2016
- Full Text
- View/download PDF
38. Whistler mode waves and Hall fields detected by MMS during a dayside magnetopause crossing
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Le Contel, O., Retino, A., Breuillard, H., Mirioni, L., Robert, P., Chasapis, A., Lavraud, B., Chust, T., Rezeau, L., Wilder, F. D., Graham, D. B., Argall, M. R., Gershman, D. J., Lindqvist, Per-Arne, Khotyaintsev, Y. V., Marklund, Göran, Ergun, R. E., Goodrich, K. A., Burch, J. L., Torbert, R. B., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Leinweber, H. K., Plaschke, F., Fischer, D., Anderson, B. J., Le, G., Moore, T. E., Pollock, C. J., Giles, B. L., Dorelli, J. C., Avanov, L., Saito, Y., Le Contel, O., Retino, A., Breuillard, H., Mirioni, L., Robert, P., Chasapis, A., Lavraud, B., Chust, T., Rezeau, L., Wilder, F. D., Graham, D. B., Argall, M. R., Gershman, D. J., Lindqvist, Per-Arne, Khotyaintsev, Y. V., Marklund, Göran, Ergun, R. E., Goodrich, K. A., Burch, J. L., Torbert, R. B., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Leinweber, H. K., Plaschke, F., Fischer, D., Anderson, B. J., Le, G., Moore, T. E., Pollock, C. J., Giles, B. L., Dorelli, J. C., Avanov, L., and Saito, Y.
- Abstract
We present Magnetospheric Multiscale (MMS) mission measurements during a full magnetopause crossing associated with an enhanced southward ion flow. A quasi-steady magnetospheric whistler mode wave emission propagating toward the reconnection region with quasi-parallel and oblique wave angles is detected just before the opening of the magnetic field lines and the detection of escaping energetic electrons. Its source is likely the perpendicular temperature anisotropy of magnetospheric energetic electrons. In this region, perpendicular and parallel currents as well as the Hall electric field are calculated and found to be consistent with the decoupling of ions from the magnetic field and the crossing of a magnetospheric separatrix region. On the magnetosheath side, Hall electric fields are found smaller as the density is larger but still consistent with the decoupling of ions. Intense quasi-parallel whistler wave emissions are detected propagating both toward and away from the reconnection region in association with a perpendicular anisotropy of the high-energy part of the magnetosheath electron population and a strong perpendicular current, which suggests that in addition to the electron diffusion region, magnetosheath separatrices could be a source region for whistler waves., QC 20160929
- Published
- 2016
- Full Text
- View/download PDF
39. A comparative study of dipolarization fronts at MMS and Cluster
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Schmid, D., primary, Nakamura, R., additional, Volwerk, M., additional, Plaschke, F., additional, Narita, Y., additional, Baumjohann, W., additional, Magnes, W., additional, Fischer, D., additional, Eichelberger, H. U., additional, Torbert, R. B., additional, Russell, C. T., additional, Strangeway, R. J., additional, Leinweber, H. K., additional, Le, G., additional, Bromund, K. R., additional, Anderson, B. J., additional, Slavin, J. A., additional, and Kepko, E. L., additional
- Published
- 2016
- Full Text
- View/download PDF
40. Whistler mode waves and Hall fields detected by MMS during a dayside magnetopause crossing
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Contel, O. Le, primary, Retinò, A., additional, Breuillard, H., additional, Mirioni, L., additional, Robert, P., additional, Chasapis, A., additional, Lavraud, B., additional, Chust, T., additional, Rezeau, L., additional, Wilder, F. D., additional, Graham, D. B., additional, Argall, M. R., additional, Gershman, D. J., additional, Lindqvist, P.‐A., additional, Khotyaintsev, Y. V., additional, Marklund, G., additional, Ergun, R. E., additional, Goodrich, K. A., additional, Burch, J. L., additional, Torbert, R. B., additional, Needell, J., additional, Chutter, M., additional, Rau, D., additional, Dors, I., additional, Russell, C. T., additional, Magnes, W., additional, Strangeway, R. J., additional, Bromund, K. R., additional, Leinweber, H. K., additional, Plaschke, F., additional, Fischer, D., additional, Anderson, B. J., additional, Le, G., additional, Moore, T. E., additional, Pollock, C. J., additional, Giles, B. L., additional, Dorelli, J. C., additional, Avanov, L., additional, and Saito, Y., additional
- Published
- 2016
- Full Text
- View/download PDF
41. Whistler mode waves and Hall fields detected by MMS during a dayside magnetopause crossing
- Author
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Le Contel, Olivier, Retinò, Alessandro, Breuillard, Hugo, Mirioni, L., Robert, Patrick, Chasapis, A., Lavraud, B., Chust, Thomas, Rezeau, Laurence, Wilder, D., Graham, D., Argall, M., Gershman, D., Lindqvist, P.-A., Khotyaintsev, Y., Marklund, G., Ergun, R. E., Goodrich, K. A., Burch, L., Torbert, R. B., Needell, J., Chutter, M., Rau, D., Dors, I., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Le, H. K., Plaschke, F., Fischer, D., Anderson, B. J., Le, G., Moore, T. E., Pollock, C. J., Giles, L., Dorelli, J. C., Avanov, L., Saito, Y., Laboratoire de Physique des Plasmas (LPP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Space Science and Applications Group [Los Alamos], Los Alamos National Laboratory (LANL), Swedish Institute of Space Physics [Uppsala] (IRF), Alfven Laboratory, Royal Institute of Technology [Stockholm] (KTH ), Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], University of New Hampshire (UNH), Experimental Physics, Saarland University [Saarbrücken], Institute of Geophysics and Planetary Physics [Los Angeles] (IGPP), University of California [Los Angeles] (UCLA), University of California-University of California, Department of Earth, Planetary and Space Sciences [Los Angeles] (EPSS), NASA Goddard Space Flight Center (GSFC), Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency [Sagamihara] (JAXA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and University of California (UC)-University of California (UC)
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
42. Low-Frequency Wave Activity Detected by MMS during Dusk Magnetopause Crossings and its Relation to Heating and Acceleration of Particles
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Olivier Le Contel, Roux, A., Alessandro Retinò, Laurent Mirioni, Fouad Sahraoui, Thomas Chust, Matthieu Berthomier, Chasapis, A., Aunai, N., Paul Leroy, Dominique Alison, Lavraud, B., Lindqvist, P. A., Khotyaintsev, Y. V., Vaivads, A., Marklund, G. T., Burch, J. L., Torbert, R. B., Moore, T. E., Ergun, R. E., Needell, J., Chutter, M., Rau, D., Dors, I., Macri, J., Russell, C. T., Magnes, W., Strangeway, R. J., Bromund, K. R., Plaschke, F., Fischer, D., Leinweber, H. K., Anderson, B. J., Nakamura, R., Argall, M. R., Le, G., Slavin, J. A., Kepko, L., Baumjohann, W., Pollock, C. J., Mauk, B., Fuselier, S. A., Goodrich, K. A., Wilder, F. D., Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Royal Institute of Technology [Stockholm] (KTH ), and Swedish Institute of Space Physics [Kiruna] (IRF)
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] ,Physics::Space Physics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
International audience; Since the 9th of July, the MMS fleet of four satellites have evolved into a tetrahedral configuration with an average inter-satellite distance of 160 km and an apogee of 12 earth radii on the dusk side. In this study we report on ultra-low (1 mHz to ~10 Hz) and very-low (10 Hz to ~ 4 kHz) frequency wave activity measured by the four satellites during several crossings of the dusk equatorial magnetopause. Since the Larmor radius of magnetosheath protons is of the order of 50 km, this inter-satellite distance allows us to investigate in detail the physics of the magnetopause at proton scales including current structures related to Kelvin-Helmholtz instability as well as other energy transfer processes. From wave polarization analysis, we characterize the different types of emissions and discuss different mechanisms of heating and acceleration of particles. In particular, we focus on the electron heating by kinetic Alfvén waves and lower hybrid waves and the electron acceleration by oblique whistler mode waves, which have been suggested as possible mechanisms from previous Cluster and THEMIS measurements.
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