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199 results on '"Yoshizumi, Miyoshi"'

1. Statistical Study of EMIC Waves and Related Proton Distributions Observed by the Arase Satellite

Author

Chae-Woo Jun, Yoshizumi Miyoshi, Satoko Nakamura, Masafumi Shoji, Masahiro Kitahara, Tomoaki Hori, Chao Yue, Jacob Bortnik, Larry R. Lyons, Kyungguk Min, Yoshiya Kasahara, Fuminori Tsuchiya, Atsushi Kumamoto, Kazushi Asamura, Iku Shinohara, Ayako Matsuoka, Shun Imajo, Shoichiro Yokota, Satoshi Kasahara, and Kunihiro Keika

Subjects
Geophysics, Space and Planetary Science
Published
2023
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6. Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby

Author

Herbert Lichtenegger, Daniel Schmid, Daikou Shiota, Martin Volwerk, Rumi Nakamura, David Fischer, H. Jeszenszky, Johannes Z. D. Mieth, Ferdinand Plaschke, Sae Aizawa, Sebastián Rojas Mata, Yoshifumi Futaana, Daniel Heyner, Wolfgang Baumjohann, Beatriz Sánchez-Cano, Ingo Richter, Yoshifumi Saito, Cyril Simon Wedlund, Iwai Kazumasa, G. Laky, Richard A. Harrison, Yoshizumi Miyoshi, A. Varsani, Nicolas André, Anna Milillo, Stefano Orsini, Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Atmospheric Science, biology, QC801-809, Science, QC1-999, Geophysics. Cosmic physics, Magnetosphere, Astronomy, Geology, Astronomy and Astrophysics, Venus, Bow shocks in astrophysics, biology.organism_classification, Solar wind, Space and Planetary Science, Planet, [SDU]Sciences of the Universe [physics], Earth and Planetary Sciences (miscellaneous), Coronal mass ejection, Gravity assist, Interplanetary magnetic field
Abstract

Out of the two Venus flybys that BepiColombo uses as a gravity assist manoeuvre to finally arrive at Mercury, the first took place on 15 October 2020. After passing the bow shock, the spacecraft travelled along the induced magnetotail, crossing it mainly in the YVSO direction. In this paper, the BepiColombo Mercury Planetary Orbiter Magnetometer (MPO-MAG) data are discussed, with support from three other plasma instruments: the Planetary Ion Camera (SERENA-PICAM) of the SERENA suite, the Mercury Electron Analyser (MEA), and the BepiColombo Radiation Monitor (BERM). Behind the bow shock crossing, the magnetic field showed a draping pattern consistent with field lines connected to the interplanetary magnetic field wrapping around the planet. This flyby showed a highly active magnetotail, with e.g. strong flapping motions at a period of ∼7 min. This activity was driven by solar wind conditions. Just before this flyby, Venus's induced magnetosphere was impacted by a stealth coronal mass ejection, of which the trailing side was still interacting with it during the flyby. This flyby is a unique opportunity to study the full length and structure of the induced magnetotail of Venus, indicating that the tail was most likely still present at about 48 Venus radii.

Published
2021
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7. Suzaku observations of Jovian diffuse hard X-ray emission

Author

Takaya Ohashi, Graziella Branduardi-Raymont, Yasunobu Uchiyama, Yoshizumi Miyoshi, Daikou Shiota, Masaki Numazawa, Kumi Ishikawa, Yuichiro Ezoe, and Tomoki Kimura

Subjects
Physics, Photon, 010504 meteorology & atmospheric sciences, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Magnetosphere, Astronomy and Astrophysics, Astrophysics, Electron, 01 natural sciences, Jovian, Solar cycle, Luminosity, Jupiter, Space and Planetary Science, Physics::Space Physics, 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
Abstract

We report on results of systematic analyses of the entire three X-ray data sets of Jupiter taken by Suzaku in 2006, 2012, and 2014. Jovian diffuse hard X-ray emission was discovered by Suzaku in 2006 when the solar activity went toward its minimum. The diffuse emission was spatially consistent with the Jovian inner magnetosphere and was spectrally fitted with a flat power-law function suggesting non-thermal emission. Thus, a scenario in which ultra-relativistic (tens of MeV) electrons in the Jovian inner magnetosphere inverse-Comptonize solar visible photons into X-ray bands has been hypothetically proposed. We focused on the dependence of the Jovian diffuse hard X-ray emission on the solar activity to verify this scenario. The solar activity in 2012 and 2014 was around the maximum of the 24th solar cycle. By combining the imaging and spectral analyses for the three data sets, we successfully separated the contribution of the diffuse emission from the emission of Jupiter’s body (i.e., the aurora and disk emission). The 1–5 keV luminosity of the diffuse emission has been stable and did not vary significantly, and did not simply depend on the solar activity, which is also known to affect the high-energy electron distribution in the Jovian inner magnetosphere scarcely. The luminosity of the body emission both in 0.2–1 and 1–5 keV, in contrast, probably depended on the solar activity and varied by a factor of 2–5. These results strongly supported the inverse-Compton scattering scenario by the ultra-relativistic electrons. In this paper, we estimate spatial and spectral distributions of the inverse-Compton scattering X-rays by Jovian magnetospheric high-energy electrons with reference to the Divine–Garrett model and found a possible agreement in an inner region (≲10 RJ) for the X-ray observations.

Published
2021
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8. ISEE_Wave: interactive plasma wave analysis tool

Author

Yoshizumi Miyoshi, S. Kurita, Iku Shinohara, M. Kitahara, Masafumi Shoji, Yoshiya Kasahara, Chae-Woo Jun, Satoko Nakamura, Shun Imajo, Shoya Matsuda, Tomoaki Hori, and Ayako Matsuoka

Subjects
QB275-343, QE1-996.5, Wave propagation, Waves in plasmas, Direction finding, Magnetosphere, Geology, Polarization (waves), Computational physics, Magnetic field, Plasma waves, Arase satellite, Space and Planetary Science, Poynting vector, SPEDAS, Geography. Anthropology. Recreation, Waveform, Geodesy, Wave power
Abstract

We have developed ISEE_Wave (Institute for Space-Earth Environmental Research, Nagoya University - Plasma Wave Analysis Tool), an interactive plasma wave analysis tool for electric and magnetic field waveforms observed by the plasma wave experiment aboard the Arase satellite. ISEE_Wave provides an integrated wave analysis environment on a graphical user interface, where users can visualize advanced wave properties, such as the electric and magnetic field wave power spectra, wave normal polar angle, polarization ellipse, planarity of polarization, and Poynting vector angle. Users can simply select a time interval for their analysis, and ISEE_Wave automatically downloads the waveform data, ambient magnetic field data, and spacecraft attitude data from the data archive repository of the ERG Science Center, and then performs necessary coordinate transformation and spectral matrix calculation. The singular value decomposition technique is used as the core technique for the wave property analysis of ISEE_Wave. On-demand analysis is possible by specifying the parameters of the wave property analysis as well as the plot styles using the graphical user interface of ISEE_Wave. The results can be saved as image files of plots and/or a tplot save file. ISEE_Wave aids in the identification of fine structures of observed plasma waves, wave mode identification, and wave propagation analysis. These properties can be used to understand plasma wave generation, propagation, and wave-particle interaction in the inner magnetosphere. ISEE_Wave can also be applied to general waveform data observed by other spacecraft by using the plug-in procedures to load the data.

Published
2021

9. STATISTICAL PROPERTIES OF AURORAL KILOMETER RADIATION: BASED ON ERG (ARASE) SATELLITE DATA

Author

Michael Mogilevsky, Irina Moiseenko, I. Shinohara, Masafumi Shoji, F. Tsuchiya, A. Kumamoto, Aleksandr Chernyshov, V. I. Kolpak, Dmitriy Chugunin, Yoshizumi Miyoshi, and Yoshiya Kasahara

Subjects
Physics, Atmospheric Science, 010504 meteorology & atmospheric sciences, auroral activity, Magnetosphere, Astronomy, lcsh:Astrophysics, Astrophysics, Radiation, 010502 geochemistry & geophysics, 01 natural sciences, satellite measurements, Geophysics, Space and Planetary Science, Kilometer, Satellite data, lcsh:QB460-466, magnetosphere, auroral kilometer radiation, Erg, 0105 earth and related environmental sciences
Abstract

In this work, we have studied the signals of auroral kilometer radiation (AKR) from sources in the auroral regions of the Northern and Southern hemispheres simultaneously recorded by one satellite. We have carried out a detailed statistical analysis of more than 20 months of continuous AKR measurements made by the ERG satellite (also known as Arase). This made it possible to confirm the previously obtained results on the location of AKR sources and seasonal changes in the radiation intensity. Open questions about the processes in the AKR source can be solved using data on the radiation pattern under various geomagnetic conditions. To answer these questions, we have estimated the cone angle of directional diagrams in the dusk and dawn sectors of Earth’s magnetosphere.

Published
2021

11. Relation of the Plasmapause to the Midlatitude Ionospheric Trough, the Sub‐Auroral Temperature Enhancement and the Distribution of Small‐Scale Field Aligned Currents as Observed in the Magnetosphere by THEMIS, RBSP, and Arase, and in the Topside Ionosphere by Swarm

Author

Balázs Heilig, Claudia Stolle, Guram Kervalishvili, Jan Rauberg, Yoshizumi Miyoshi, Fuminori Tsuchiya, Atsushi Kumamoto, Yoshiya Kasahara, Masafumi Shoji, Satoko Nakamura, Masahiro Kitahara, and Iku Shinohara

Subjects
Geophysics, Space and Planetary Science
Abstract

The relation between the plasmapause (PP) and various ionospheric phenomena, such as the midlatitude ionospheric trough (MIT) has been studied for decades. More recently, it was found that the equatorward boundary of small-scale field-aligned currents (SSB) and the PP are also closely coupled. In spite of prolonged efforts many details of these relationships, as well as the mechanisms responsible for them remain poorly understood. ESA's Swarm mission in conjunction with magnetospheric missions (RBSP, Arase, and THEMIS) provides an unprecedented opportunity to study these relationships on a global scale and over an extended period. Swarm delivers observations of MIT, the associated sub-auroral electron temperature enhancement (SETE), as well as SSB, while PP crossings can be inferred from in-situ magnetospheric electron density measurements. In this study, we use 7 years of Swarm observations and PP positions from 2014 to 2017 to address some of the open questions. We confirm that MIT/SETE and PP are directly coupled, however only in the nighttime. Their correlation remains high after post-dawn, however, with an increasing, MLT-dependent time lag. Afternoon MIT observations were found conjugated with a plasmaspheric plume. The correlation between SSB and PP is also high and they intersect each other near MLT midnight. Our results confirm the scenario that the PP is formed on the night side, and propagates to the dayside by co-rotating with the Earth and suggest that the plasma is transported from the depleted ionospheric/dense plasmaspheric stagnation region also westward/sunward forming the afternoon MIT/narrow plumes, respectively.

Published
2022
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12. Altitude of pulsating arcs as inferred from tomographic measurements

Author

Vladimir Safargaleev, Tima Sergienko, Keisuke Hosokawa, Shin-ichiro Oyama, Yasunobu Ogawa, Yoshizumi Miyoshi, Satoshi Kurita, and Ryochi Fujii

Subjects
Altitude of auroras, Optical tomography, Pulsating auroras, Internal modulation, Space and Planetary Science, Physics::Space Physics, Geology
Abstract

Data from three all-sky cameras in Kiruna and Tjautjas (Sweden) were used to estimate the altitude of pulsating arc-like forms using optical tomography. The event under consideration occurred during the substorm recovery phase and comprised both periodic luminosity variation of the on/off type with repetition periods of 3–6 s (main pulsations) and faster scintillation (approximately 2 Hz) during the “on” phase of the main pulsations. It is found that (1) the altitudes of the pulsating auroral arcs decrease during “on” intervals from ~ 95 km to ~ 92 km and (2) for two closely spaced arcs, internal modulation took place only in the lowest arc. The results may be interpreted in the frame of the traditional mechanism assuming electron scattering via VLF-wave/particle interaction in the equatorial magnetosphere, while the internal modulation may also be alternatively interpreted in the frame of the less-often inferred mechanism of field-aligned acceleration somewhere between the equatorial plane and ionosphere. Graphical Abstract

Published
2022
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13. Space-to-space very low frequency radio transmission in the magnetosphere using the DSX and Arase satellites

Author

James P. McCollough, Yoshizumi Miyoshi, Gregory P. Ginet, William R. Johnston, Yi-Jiun Su, Michael J. Starks, Yoshiya Kasahara, Hirotsugu Kojima, Shoya Matsuda, Iku Shinohara, Paul Song, Bodo W. Reinisch, Ivan A. Galkin, Umran S. Inan, David S. Lauben, Ivan Linscott, Alan G. Ling, Shawn Allgeier, Richard Lambour, Jon Schoenberg, William Gillespie, Stephen Stelmash, Kevin Roche, Andrew J. Sinclair, Jenny C. Sanchez, Gregory F. Pedinotti, Jarred T. Langhals, İnan, Umran Savaş (ORCID 0000-0001-5837-5807 & YÖK ID 177880), McCollough, J.P., Miyoshi, Y., Ginet, G.P., Johnston, W.R., Su, Y.J., Starks, M.J., Kasahara, Y., Kojima, H., Matsuda, S., Shinohara, I., Song, P., Reinisch, B.W., Galkin, I.A., Lauben, D.S., Linscott, I., Ling, A.G., Allgeier, S., Lambour, R., Schoenberg, J., Gillespie, W., Stelmash, S., Roche, K., Sinclair, A.J., Sanchez, J.C., Pedinotti, G.F., Langhals, J.T., College of Engineering, and Department of Electrical and Electronics Engineering

Subjects
Active experiment, Arase, DSX, Magnetosphere, VLF propagation, Space and Planetary Science, Physics::Space Physics, Geology, Physics::Geophysics
Abstract

Very low frequency (VLF) waves (about 3-30 kHz) in the Earth's magnetosphere interact strongly with energetic electrons and are a key element in controlling dynamics of the Van Allen radiation belts. Bistatic very low frequency (VLF) transmission experiments have recently been conducted in the magnetosphere using the high-power VLF transmitter on the Air Force Research Laboratory's Demonstration and Science Experiments (DSX) spacecraft and an electric field receiver onboard the Japan Aerospace Exploration Agency's Arase (ERG) spacecraft. On 4 September 2019, the spacecraft came within 410 km of each other and were in geomagnetic alignment. During this time, VLF signals were successfully transmitted from DSX to Arase, marking the first successful reception of a space-to-space VLF signal. Arase measurements were consistent with field-aligned propagation as expected from linear cold plasma theory. Details of the transmission event and comparison to VLF propagation model predictions are presented. The capability to directly inject VLF waves into near-Earth space provides a new way to study the dynamics of the radiation belts, ushering in a new era of space experimentation., Air Force Research Laboratory’s Space Vehicles Directorate; Japan Society for the Promotion of Science (JSPS) Grants-in-Aid-for Scientific Research

Published
2022

14. Statistical survey of Arase satellite data sets in conjunction with the Finnish riometer network

Author

Neethal Thomas, Antti Kero, Yoshizumi Miyoshi, Kazuo Shiokawa, Miikka Hyötylä, Tero Raita, Yoshiya Kasahara, Iku Shinohara, Shoya Matsuda, Satoko Nakamura, Satoshi Kasahara, Shoichiro Yokota, Kunihiro Keika, Tomoaki Hori, Takefumi Mitani, Takeshi Takashima, Kazushi Asamura, Yoichi Kazama, Shiang‐Yu Wang, C.‐W. Jun, and Nana Higashio

Subjects
wave particle interaction, Geophysics, EEP, Space and Planetary Science, riometer, Physics::Space Physics, plasma sheet injection, whistler mode chorus waves, Arase
Abstract

During disturbed geomagnetic conditions, the energetic particles in the inner magnetosphere are known to undergo precipitation loss due to interaction with various plasma waves. This study, investigates the energetic particle precipitation events statistically using coordinate observations from the ground riometer network and the inner-magnetospheric satellite mission, Arase. We have compared cosmic noise absorption (CNA) data obtained from the Finnish ground riometer network located in the auroral/sub-auroral latitudes with the comprehensive data set of omnidirectional electron/proton flux and plasma waves in ELF/VLF frequency range from the Arase satellite during the overpass intervals. The study period includes one and a half years of data between March 2017 and September 2018 covering Arase conjunctions with the riometer stations from all magnetic local time sectors. The relation between the plasma flux/waves observed at the satellite with the riometer absorptions are investigated statistically for CNA (absorption >0.5 dB) and non-CNA (absorption

Published
2022

15. Study of an Equatorward Detachment of Auroral Arc From the Oval Using Ground‐Space Observations and the BATS‐R‐US–CIMI Model

Author

Masafumi Shoji, Fuminori Tsuchiya, Shun Imajo, Iku Shinohara, Yasumasa Kasaba, Sneha Yadav, Kazuo Shiokawa, Ayako Matsuoka, Yoichi Kazama, Sunny W. Y. Tam, Naoko Takahashi, T. F. Chang, T. Hori, Shigeru Kasahara, Shoichiro Yokota, Yudai Inaba, Kazushi Asamura, Bo Jhou Wang, Shoya Matsuda, Shiang-Yu Wang, Atsushi Kumamoto, Yoshizumi Miyoshi, Kanako Seki, Shin-ichiro Oyama, Kunihiro Keika, C-W Jun, and Yoshiya Kasahara

Subjects
Arc (geometry), Geophysics, Space and Planetary Science, Substorm, Space (mathematics), Geology
Published
2021
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16. Propagation Mechanism of Medium Wave Broadcasting Waves Observed by the Arase Satellite: Hectometric Line Spectra

Author

Tatsuhiro Yokoyama, Kozo Hashimoto, Fuminori Tsuchiya, Yoshiya Kasahara, Isamu Nagano, Yuichi Otsuka, Ayako Matsuoka, Atsuki Shinbori, Atsushi Kumamoto, and Yoshizumi Miyoshi

Subjects
Physics, Satellite observation, Geophysics, Broadcasting (networking), Space and Planetary Science, Satellite, Medium wave, Mechanism (sociology), Spectral line, Computational physics
Published
2021
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17. Relative Contribution of ULF Waves and Whistler‐Mode Chorus to the Radiation Belt Variation During the May 2017 Storm

Author

Iku Shinohara, David Hartley, Kunihiro Keika, Masafumi Shoji, Naoko Takahashi, Kanako Seki, Yihua Zheng, Ayako Matsuoka, Yasumasa Kasaba, Tomoaki Hori, Shoichiro Yokota, Yoshizumi Miyoshi, N. Higashio, Yoshiya Kasahara, Satoshi Kasahara, Shun Imajo, Mei-Ching Fok, and Satoko Nakamura

Subjects
Physics, symbols.namesake, Geophysics, biology, Space and Planetary Science, Van Allen radiation belt, symbols, Chorus, Storm, Whistler mode, biology.organism_classification, Variation (astronomy)
Published
2021
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18. Special issue 'Solar–terrestrial environment prediction: toward the synergy of science and forecasting operation of space weather and space climate'

Author

Tomas Berger, Kiyoshi Ichimoto, Mamoru Ishii, Shigeo Yoden, Yoshizumi Miyoshi, Kanya Kusano, Huixin Liu, and Terry Onsager

Subjects
QB275-343, QE1-996.5, Meteorology, Space and Planetary Science, Geography. Anthropology. Recreation, Environmental science, Geology, Terrestrial ecosystem, Space weather, Space (commercial competition), Geodesy
Published
2021
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20. Field‐Aligned Electron Density Distribution of the Inner Magnetosphere Inferred From Coordinated Observations of Arase and Van Allen Probes

Author

Atsuki Shinbori, Ayako Matsuoka, Yoshiya Kasahara, Yuki Obana, Naomi Maruyama, Atsushi Kumamoto, Shoya Matsuda, Yoshizumi Miyoshi, Charles W. Smith, Robert J. MacDowall, Yukinaga Miyashita, William S. Kurth, Iku Shinohara, Fuminori Tsuchiya, Masahito Nose, and Masafumi Shoji

Subjects
Physics, Geomagnetic storm, Geophysics, Field (physics), Space and Planetary Science, Conjunction (astronomy), Equator, Magnetosphere, Plasmasphere, Van Allen Probes, Astrophysics, Magnetic field
Abstract

The RBSP and the Arase satellites have different inclinations and sometimes they fly both near the equator and off the equator on the same magnetic field line, simultaneously. Such conjunction even...

Published
2021
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21. Magnetic Field and Energetic Particle Flux Oscillations and High‐Frequency Waves Deep in the Inner Magnetosphere During Substorm Dipolarization: ERG Observations

Author

Yoshizumi Miyoshi, Yoichi Kazama, Shun Imajo, Shoichiro Yokota, S. Kurita, Satoshi Kasahara, Sunny W. Y. Tam, Atsushi Kumamoto, Yoshiya Kasahara, Shiang-Yu Wang, Mariko Teramoto, Bo Jhou Wang, Yukinaga Miyashita, Yoshimasa Tanaka, Kazushi Asamura, Chae-Woo Jun, Kunihiro Keika, T. F. Chang, Masafumi Shoji, Iku Shinohara, Fuminori Tsuchiya, Tomoaki Hori, Ayako Matsuoka, and Akira Kadokura

Subjects
Physics, Geophysics, Space and Planetary Science, Substorm, Magnetosphere, Astrophysics, High Frequency Waves, Particle flux, Erg, Magnetic field, Ballooning instability
Abstract

Using Exploration of energization and Radiation in Geospace (ERG or Arase) spacecraft data, we studied low-frequency magnetic field and energetic particle flux oscillations and high-frequency waves deep in the inner magnetosphere at a radial distance of ~4–5 during substorm dipolarization. The magnetic field oscillated alternately between dipole-like and taillike configuration at a period of 1 min during dipolarization. When the magnetic field was dipole-like, the parallel magnetic component of the Pi2 waves was at trough. Both energetic ion and electron fluxes with a few to tens of kiloelectronvolts enhanced out of phase, indicating that magnetosonic waves were in slow mode. Field-aligned currents also oscillated. These observations are consistent with signatures of ballooning instability. In addition, we found that broadband waves from the Pi1 range to above the electron cyclotron frequency tended to appear intermittently in the central plasma sheet near dipole-like configuration.

Published
2021
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22. First Simultaneous Observation of a Night Time Medium‐Scale Traveling Ionospheric Disturbance From the Ground and a Magnetospheric Satellite

Author

Masafumi Shoji, Yoichi Kazama, Shigeo Nakamura, Yasumasa Kasaba, Atsushi Kumamoto, Shun Imajo, T. F. Chang, Shoichiro Yokota, Ayako Matsuoka, Kazushi Asamura, Iku Shinohara, Yoshizumi Miyoshi, Chae-Woo Jun, Kazuo Shiokawa, Shiang-Yu Wang, Yoshiya Kasahara, Kei Kawai, Fuminori Tsuchiya, Yuichi Otsuka, Sunny W. Y. Tam, Bo Jhou Wang, Kunihiro Keika, Shin-ichiro Oyama, T. Hori, and Shigeru Kasahara

Subjects
Electron density, Geophysics, Disturbance (geology), Space and Planetary Science, Electric field, Satellite, Ionosphere, Geodesy, Medium scale, Geology
Published
2021
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23. Variations in Cosmic Noise Absorption in Association With Equatorward Development of the Pulsating Auroral Patch: A Case Study to Estimate the Energy Spectra of Auroral Precipitating Electrons

Author

Keisuke Hosokawa, Tero Raita, Yoshizumi Miyoshi, Taishiro Miyamoto, Yasunobu Ogawa, Shin-ichiro Oyama, and S. Kurita

Subjects
Physics, 010504 meteorology & atmospheric sciences, Astrophysics, Electron, 01 natural sciences, Spectral line, Geophysics, Space and Planetary Science, 0103 physical sciences, Riometer, Ionosphere, Absorption (electromagnetic radiation), 010303 astronomy & astrophysics, Cosmic noise, Energy (signal processing), 0105 earth and related environmental sciences
Published
2021
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24. PSTEP: project for solar–terrestrial environment prediction

Author

Keisuke Hosokawa, Hiroyuki Shinagawa, S. Kurita, Akimasa Yoshikawa, Mamoru Ishii, Haruhisa Matsumoto, Shinsuke Imada, Hiroko Miyahara, Hideyuki Hotta, Shigeo Yoden, Hitoshi Fujiwara, Takashi Sakurai, Yoichiro Hanaoka, Yusuke Ebihara, Chihiro Tao, Seiji Yashiro, Naoto Nishizuka, Kazumasa Iwai, Kazuo Shiokawa, Kohei Yoshida, Hideharu Akiyoshi, Takefumi Mitani, Hidekatsu Jin, Ayumi Asai, Hisashi Hayakawa, Satoko Nakamura, Takeshi Takashima, Kanya Kusano, Shinichi Watari, Takashi Kikuchi, Yuto Katoh, Shin Toriumi, Kiyoshi Ichimoto, Ryuho Kataoka, Hiroyuki Nakata, Toshifumi Shimizu, Tada-nori Goto, Shinji Saito, Yuki Kubo, Aoi Nakamizo, Tatsuhiko Sato, Toshihiko Iyemori, Kyoko Watanabe, Tsutomu Nagatsuma, Daikou Shiota, Susumu Saito, Yoshizumi Miyoshi, Satoru Ueno, Kornyanat Hozumi, Yasunobu Miyoshi, and Yuichi Otsuka

Subjects
Solar physics, QB275-343, QE1-996.5, Research groups, Space weather, business.industry, Geology, Earth environmental system, Engineering management, Graduate students, Space and Planetary Science, Publishing, Geography. Anthropology. Recreation, Information system, Christian ministry, business, Solar–terrestrial environment, Geodesy, Global environmental analysis
Abstract

Although solar activity may significantly impact the global environment and socioeconomic systems, the mechanisms for solar eruptions and the subsequent processes have not yet been fully understood. Thus, modern society supported by advanced information systems is at risk from severe space weather disturbances. Project for solar–terrestrial environment prediction (PSTEP) was launched to improve this situation through synergy between basic science research and operational forecast. The PSTEP is a nationwide research collaboration in Japan and was conducted from April 2015 to March 2020, supported by a Grant-in-Aid for Scientific Research on Innovative Areas from the Ministry of Education, Culture, Sports, Science and Technology of Japan. By this project, we sought to answer the fundamental questions concerning the solar–terrestrial environment and aimed to build a next-generation space weather forecast system to prepare for severe space weather disasters. The PSTEP consists of four research groups and proposal-based research units. It has made a significant progress in space weather research and operational forecasts, publishing over 500 refereed journal papers and organizing four international symposiums, various workshops and seminars, and summer school for graduate students at Rikubetsu in 2017. This paper is a summary report of the PSTEP and describes the major research achievements it produced.

Published
2021
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25. Pre-flight Calibration and Near-Earth Commissioning Results of the Mercury Plasma Particle Experiment (MPPE) Onboard MMO (Mio)

Author

Jean-Jacques Berthelier, Henning Fischer, Mathieu Petiot, Kazushi Asamura, Eric Le Comte, Zdenĕk Nĕmec̆ek, Andrei Fedorov, Giuseppe Consolini, Yoichi Kazama, Haruhisa Matsumoto, Yoshizumi Miyoshi, Christian Mazelle, Kanako Seki, Jean Rouzaud, Christophe Verdeil, Dominique Delcourt, Wataru Miyake, Harald Michalik, F. Leblanc, Björn Fiethe, Ulrich Bührke, Roberto Bruno, Peter Wurz, Iannis Dandouras, Alain Barthe, Henry-Claude Séran, Jean-André Sauvaud, Maria Federica Marcucci, Mats Holmström, Stas Barabash, Shoichiro Yokota, H. Andersson, Joachim Woch, Masahiro Hoshino, Iku Shinohara, Philippe Louarn, Benoit Lavraud, Dominique Fontaine, Vincent Génot, Alexandre Cadu, Yuki Harada, Christian Jacquey, Anne-Marie Frezoul, Andrew J. Coates, Bruno Katra, Yoshifumi Futaana, Emmanuel Penou, Stefan Karlsson, Jean-Marie Illiano, Markus Fraenz, Claude Aoustin, Qiugang Zong, Catherine Garat, Qiu-Mei Lee, Wing-Huen Ip, Manabu Shimoyama, Masaki N. Nishino, David Moirin, Norbert Krupp, Nicolas André, Masaki Fujimoto, Mitsuo Oka, Hiroshi Hasegawa, Martin Wieser, Guy Peyre, Jana Safrankova, Jean-Louis Médale, Kunihiro Keika, Jean-Denis Techer, Takeshi Takashima, T. Yanagimachi, Naoki Terada, Takefumi Mitani, Masafumi Hirahara, Yoshifumi Saito, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency [Sagamihara] (JAXA), Laboratoire de Physique des Plasmas (LPP), 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), Institute for Space-Earth Environmental Research [Nagoya] (ISEE), Nagoya University, Swedish Institute of Space Physics [Kiruna] (IRF), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Osaka University [Osaka], Space Sciences Laboratory [Berkeley] (SSL), University of California [Berkeley] (UC Berkeley), University of California (UC)-University of California (UC), Kyoto University, AKKA Technologies, Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Société MICROTEC, Nexeya Conseil & Formation, COMAT, Faculty of Mathematics and Physics [Charles University of Praha], Charles University [Prague] (CU), Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), Istituto Nazionale di Astrofisica (INAF), Tokai University, The University of Tokyo (UTokyo), Mullard Space Science Laboratory (MSSL), University College of London [London] (UCL), HELIOS - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), Max-Planck-Gesellschaft, Institute of Computer and Network Engineering [Braunschweig] (IDA), Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig], Japan Aerospace Exploration Agency [Tsukuba] (JAXA), Rikkyo University [Tokyo], Peking University [Beijing], University of Bern, Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), Academia Sinica, National Central University [Taiwan] (NCU), Tohoku University [Sendai], 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), University of California [Berkeley], University of California-University of California, Kyoto University [Kyoto], Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), and Max-Planck-Institut für Sonnensystemforschung (MPS)

Subjects
Spectrum analyzer, High energy particle, 010504 meteorology & atmospheric sciences, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], chemistry.chemical_element, 7. Clean energy, 01 natural sciences, law.invention, Orbiter, law, 0103 physical sciences, Calibration, Aerospace engineering, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, [PHYS]Physics [physics], Energetic neutral atom, Spacecraft, business.industry, Astronomy and Astrophysics, Mercury (element), Solar wind, chemistry, 13. Climate action, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Environmental science, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; BepiColombo Mio (previously called MMO: Mercury Magnetospheric Orbiter) was successfully launched by Ariane 5 from Kourou, French Guiana on October 20, 2018. The Mercury Plasma/Particle Experiment (MPPE) is a comprehensive instrument package onboard Mio spacecraft used for plasma, high-energy particle and energetic neutral atom measurements. It consists of seven sensors including two Mercury Electron Analyzers (MEA1 and MEA2), Mercury Ion Analyzer (MIA), Mass Spectrum Analyzer (MSA), High Energy Particle instrument for electron (HEP-ele), High Energy Particle instrument for ion (HEP-ion), and Energetic Neutrals Analyzer (ENA). Significant efforts were made pre-flight to calibrate all of the MPPE sensors at the appropriate facilities on the ground. High voltage commissioning of MPPE analyzers was successfully performed between June and August 2019 and in February 2020 following the completion of the low voltage commissioning in November 2018. Although all of the MPPE analyzers are now ready to begin observation, the full service performance has been delayed until Mio’s arrival at Mercury. Most of the fields of view (FOVs) of the MPPE analyzers are blocked by the thermal shield surrounding the Mio spacecraft during the cruising phase. Together with other instruments on Mio including Magnetic Field Investigation (MGF) and Plasma Wave Investigation (PWI) that measure plasma field parameters, MPPE will contribute to the comprehensive understanding of the plasma environment around Mercury when BepiColombo/Mio begins observation after arriving at the planet Mercury in December 2025.

Published
2021
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26. Field‐Aligned Low‐Energy O + Flux Enhancements in the Inner Magnetosphere Observed by Arase

Author

Kazushi Asamura, T. Hori, Mariko Teramoto, Yoshizumi Miyoshi, Ayako Matsuoka, Masahito Nose, Masafumi Hirahara, and Iku Shinohara

Subjects
Physics, Geophysics, Low energy, Field (physics), Space and Planetary Science, Magnetosphere, Flux, Outflow, Computational physics
Abstract

The present study examines the low-energy ion flux variations observed by the Arase satellite in the inner magnetosphere. From the magnetic field and ion flux data obtained by the fluxgate magnetometer and the low-energy particle experiments–ion mass analyzer onboard Arase, we find 55 events of the low-energy O+ flux enhancement accompanied with magnetic field dipolarization in the periods of April 1–October 31, 2017 and July 1, 2018–January 31, 2019. The low-energy O+ flux enhancements (a) start a few minutes after the dipolarization onset, (b) have energy-dispersed signatures with decreasing energy from a few keV down to ∼10 eV, (c) are observed in both storm and non-storm periods, (d) have a field-aligned distribution (α ∼ 0° in the southern hemisphere and α ∼ 180° in the northern hemisphere), (e) are accompanied by the low-energy H+ flux enhancements that have lower energies than O+ by a factor of 3–10, and (f) increase the O+ density and the O+/H+ density ratio by ∼10 times and 4–5 times, respectively. We perform a numerical simulation to trace ion trajectories forward in time from the Arase positions. It is revealed that both H+ and O+ ions drift eastward and reach the dawn-to-morning sector without being lost in the ionosphere, if the pitch angle scattering effect is considered near the equatorial plane. This result suggests that these low-energy field-aligned ions can contribute to formation of the warm plasma cloak.

Published
2021
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27. Spatial Evolution of Wave‐Particle Interaction Region Deduced From Flash‐Type Auroras and Chorus‐Ray Tracing

Author

Kousuke Imamura, Tomohiro Inoue, Yasunobu Ogawa, Ryuho Kataoka, Yoshiya Kasahara, Mitsunori Ozaki, Yusuke Ebihara, Kazuo Shiokawa, Keisuke Hosokawa, Yoshimasa Tanaka, Akira Kadokura, Satoshi Yagitani, Shin-ichiro Oyama, and Yoshizumi Miyoshi

Subjects
Physics, Flash (photography), Geophysics, Wave–particle duality, biology, Space and Planetary Science, Chorus, Spatial evolution, Ray tracing (graphics), biology.organism_classification, Computational physics
Published
2021
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28. Rocket Observation of Sub‐Relativistic Electrons in the Quiet Dayside Auroral Ionosphere

Author

A. Nikitenko, Yoshizumi Miyoshi, Y. Fedorenko, Iku Shinohara, Shin Sugo, Shinji Saito, O. Kawashima, Yasunobu Ogawa, Tomoaki Hori, Shigeru Kasahara, Reiko Nomura, Kazushi Asamura, C. Koehler, N. Yagi, Yoshitaka Saito, Ayako Matsuoka, Mizuki Fukizawa, Keisuke Hosokawa, Takeshi Sakanoi, Takefumi Mitani, and T. Namekawa

Subjects
Physics, Geophysics, business.product_category, Rocket, Space and Planetary Science, QUIET, Astronomy, Electron, Ionosphere, business
Published
2021
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29. Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres

Author

Masaki Tsutsumi, Masahito Nose, Mizuki Fukizawa, Ryuho Kataoka, Takanori Nishiyama, Tsutomu Nagatsuma, Akiko Fujimoto, Mariko Teramoto, Mitsuru Hikishima, Yoshizumi Miyoshi, S. I. Oyama, Akira Kadokura, Manabu Shinohara, Shoya Matsuda, Reiko Nomura, Kouichi Nishimura, Fuminori Tsuchiya, I. Shinohara, Masafumi Shoji, A. Matsuoka, Keisuke Hosokawa, Atsushi Kumamoto, Yoshiya Kasahara, Kazuo Shiokawa, A. Sessai Yukimatu, Kaoru Sato, Yoshimasa Tanaka, Mitsunori Ozaki, and Ralph Latteck

Subjects
Physics, Arase conjugate observation, chorus waves, conjugate observation, Astrophysics, EMIC waves, Arase, MST radar, Mesosphere, polar mesosphere winter echoes, Geophysics, Magnetospheric plasma, Space and Planetary Science, Physics::Space Physics, Polar, Physics::Atmospheric and Oceanic Physics
Abstract

著者人数: 29名, Accepted: 2019-09-02, 資料番号: SA1190133000

Published
2019

30. Meridional Distribution of Middle‐Energy Protons and Pressure‐Driven Currents in the Nightside Inner Magnetosphere: Arase Observations

Author

Yoshizumi Miyoshi, Shoichiro Yokota, Masahito Nose, Tomoaki Hori, S. Oimatsu, Reiko Nomura, Shun Imajo, A. Matsuoka, Kunihiro Keika, Satoshi Kasahara, Akiko Fujimoto, Mariko Teramoto, I. Shinohara, and K. Yamamoto

Subjects
Physics, pressure‐driven current, Arase satellite, Geophysics, Distribution (number theory), meridional distributions, Space and Planetary Science, Magnetosphere, Zonal and meridional, nightside inner magnetosphere, ring current protons, Energy (signal processing), Computational physics
Abstract

著者人数: 14名, Accepted: 2019-07-12, 資料番号: SA1190075000

Published
2019
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31. Tracking the Region of High Correlation Between Pulsating Aurora and Chorus: Simultaneous Observations With Arase Satellite and Ground-Based All-Sky Imager in Russia

Author

Keisuke Hosokawa, Mitsunori Ozaki, Satoshi Kurita, S. Kawamura, I. Shinohara, Shin-ichiro Oyama, Boris Kozelov, Y. Kawamura, Shoya Matsuda, Yoshizumi Miyoshi, Ayako Matsuoka, and Yoshiya Kasahara

Subjects
Physics, Geophysics, biology, Space and Planetary Science, Sky, media_common.quotation_subject, Chorus, Satellite, biology.organism_classification, Tracking (particle physics), Remote sensing, media_common
Abstract

著者人数: 12名, Accepted: 2019-03-16, 資料番号: SA1190073000

Published
2019

32. Evening Side EMIC Waves and Related Proton Precipitation Induced by a Substorm

Author

Sung Jun Noh, Masafumi Shoji, Atsushi Kumamoto, Yoshiya Kasahara, Yoshizumi Miyoshi, Yasumasa Kasaba, Hyomin Kim, Kazushi Asamura, A. G. Demekhov, A. A. Lubchich, Shoichiro Yokota, T. Hori, Shigeru Kasahara, Kunihiro Keika, Iku Shinohara, A. G. Yahnin, Fuminori Tsuchiya, Tero Raita, T. A. Popova, Ayako Matsuoka, and Shigeo Nakamura

Subjects
Physics, Geophysics, Evening, Space and Planetary Science, Physics::Space Physics, Substorm, Proton precipitation, Atmospheric sciences
Abstract

We present the results of a multi-point and multi-instrument study of electromagnetic ion cyclotron (EMIC) waves and related energetic proton precipitation during a substorm. We analyze the data from Arase (ERG) and Van Allen Probes (VAPs) A and B spacecraft for an event of 16 and 17 UT on December 1, 2018. VAP-A detected an almost dispersionless injection of energetic protons related to the substorm onset in the night sector. Then the proton injection was detected by VAP-B and further by Arase, as a dispersive enhancement of energetic proton flux. The proton flux enhancement at every spacecraft coincided with the EMIC wave enhancement or appearance. This data show the excitation of EMIC waves first inside an expanding substorm wedge and then by a drifting cloud of injected protons. Low-orbiting NOAA/POES and MetOp satellites observed precipitation of energetic protons nearly conjugate with the EMIC wave observations in the magnetosphere. The proton pitch-angle diffusion coefficient and the strong diffusion regime index were calculated based on the observed wave, plasma, and magnetic field parameters. The diffusion coefficient reaches a maximum at energies corresponding well to the energy range of the observed proton precipitation. The diffusion coefficient values indicated the strong diffusion regime, in agreement with the equality of the trapped and precipitating proton flux at the low-Earth orbit. The growth rate calculations based on the plasma and magnetic field data from both VAP and Arase spacecraft indicated that the detected EMIC waves could be generated in the region of their observation or in its close vicinity.

Published
2021
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33. The Characteristics of EMIC Waves in the Magnetosphere Based on the Van Allen Probes and Arase Observations

Author

S. Kurita, Masafumi Shoji, Yoshizumi Miyoshi, Chao Yue, Larry R. Lyons, Jacob Bortnik, Iku Shinohara, Craig Kletzing, Ayako Matsuoka, Chae-Woo Jun, Fuminori Tsuchiya, Yoshiya Kasahara, Satoko Nakamura, Yasumasa Kasaba, Atsushi Kumamoto, Shun Imajo, and Shoya Matsuda

Subjects
Physics, Geophysics, Space and Planetary Science, Emic and etic, Astronomy, Magnetosphere, Van Allen Probes
Published
2021
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35. Comparative study of electric currents and energetic particle fluxes in a solar flare and Earth magnetospheric substorm

Author

Anton Artemyev, Ivan Zimovets, Ivan Sharykin, Yukitoshi Nishimura, Cooper Downs, James Weygand, Robyn Fiori, Xiao-Jia Zhang, Andrei Runov, Marco Velli, Vassilis Angelopoulos, Olga Panasenco, Christopher T. Russell, Yoshizumi Miyoshi, Satoshi Kasahara, Ayako Matsuoka, Shoichiro Yokota, Kunihiro Keika, Tomoaki Hori, Yoichi Kazama, Shiang-Yu Wang, Iku Shinohara, and Yasunobu Ogawa

Subjects
Physics - Space Physics, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, FOS: Physical sciences, Astrophysics::Solar and Stellar Astrophysics, Astronomy and Astrophysics, Space Physics (physics.space-ph), Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

Magnetic field line reconnection is a universal plasma process responsible for the conversion of magnetic field energy to plasma heating and charged particle acceleration. Solar flares and Earth's magnetospheric substorms are two of the most investigated dynamical systems where global magnetic field reconfiguration is accompanied by energization of plasma populations. Such a reconfiguration includes formation of a long-living current system connecting the primary energy release region and cold dense conductive plasma of the photosphere/ionosphere. In both flares and substorms the evolution of this current system correlates with the formation and dynamics of energetic particle fluxes (although energy ranges can be different for these systems). Our study is focused on the similarity between flares and substorms. Using a wide range of data sets available for flare and substorm investigations, we qualitatively compare the dynamics of currents and energetic particle fluxes for one flare and one substorm. We show that there is a clear correlation between energetic particle precipitations (associated with energy release due to magnetic reconnection seen from riometer and hard X-ray measurements) and magnetic field reconfiguration/formation of the current system, whereas the long-term current system evolution correlates better with hot plasma fluxes (seen from in situ and soft X-ray measurements). We then discuss how data sets of in situ measurements of magnetospheric substorms can help interpret solar flare data.

Published
2021

36. Simultaneous Observation of Two Isolated Proton Auroras at Subauroral Latitudes by a Highly Sensitive All‐Sky Camera and Van Allen Probes

Author

Charles W. Smith, Kohki Nakamura, Harlan E. Spence, John R. Wygant, Kazuo Shiokawa, Herbert O. Funsten, Martin Connors, Robert J. MacDowall, Geoff Reeves, John W. Bonnell, Yoshizumi Miyoshi, Atsuki Shinbori, and Yuichi Otsuka

Subjects
Physics, Geophysics, Proton, Computer Science::Systems and Control, Space and Planetary Science, Sky, media_common.quotation_subject, Physics::Space Physics, Astronomy, Van Allen Probes, Highly sensitive, Latitude, media_common
Abstract

Isolated proton auroras (IPAs) appearing at subauroral latitudes are generated by energetic protons precipitating from the magnetosphere through interaction with electromagnetic ion cyclotron (EMIC) waves. An IPA thus indicates the spatial scale and temporal variation of wave-particle interactions in the magnetosphere. In this study, a unique event of simultaneous ground and magnetospheric satellite observations of two IPAs were conducted on March 16, 2015, using an all-sky imager at Athabasca, Canada and Van Allen Probes. The Van Allen Probes observed two isolated EMIC waves with frequencies of ∼1 and 0.4 Hz at L ≈ 5.0 when the satellite footprint crossed over the two IPAs. This suggests that the IPAs were caused by localized EMIC waves. Proton flux at 5–20 keV increased locally when the EMIC waves appeared. Electron flux at energies below ∼500 eV also increased. Temperature anisotropy of the energetic protons was estimated at 1.5–2.5 over a wide L-value range of 3.0–5.2. Electron density gradually decreased from L = 3.5 to 5.4, suggesting that the EMIC wave at L ≈ 5.0 was located in the gradual plasmapause. From these observations, we conclude that the localized IPAs and associated EMIC waves took place because of localized enhancement of energetic proton flux and plasma density structure near the plasmapause. The magnetic field observed by the satellite showed small variation during the wave observation, indicating that the IPAs were accompanied by the weak field-aligned current.

Published
2021
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38. Energy Transfer Between Hot Protons and Electromagnetic Ion Cyclotron Waves in Compressional Pc5 Ultra‐low Frequency Waves

Author

Barbara L. Giles, Scott A. Boardsen, Masafumi Shoji, N. Kitamura, Masafumi Hirahara, Hiroshi Hasegawa, Robert J. Strangeway, P. A. Lindqvist, Takanobu Amano, Yoshitaka Saito, Christopher T. Russell, Mariko Teramoto, Yoshiharu Omura, Shoichiro Yokota, M. Kitahara, James L. Burch, Shigeo Nakamura, Narges Ahmadi, Stephen A. Fuselier, Yuto Katoh, D. J. Gershman, Yoshizumi Miyoshi, and Robert E. Ergun

Subjects
Physics, Geophysics, Space and Planetary Science, law, Energy transfer, Cyclotron, Atomic physics, Ultra low frequency, law.invention, Ion
Abstract

The Magnetospheric Multiscale (MMS) spacecraft observed many enhancements of electromagnetic ion cyclotron (EMIC) waves in an event in the late afternoon outer magnetosphere. These enhancements occurred mainly in the troughs of magnetic field intensity associated with a compressional ultralow frequency (ULF) wave. The ULF wave had a period of ∼2–5 min (Pc5 frequency range) and was almost static in the plasma rest frame. The magnetic and ion pressures were in antiphase. They are consistent with mirror-mode type structures. We apply the Wave-Particle Interaction Analyzer method, which can quantitatively investigate the energy transfer between hot anisotropic protons and EMIC waves, to burst-mode data obtained by the four MMS spacecraft. The energy transfer near the cyclotron resonance velocity was identified in the vicinity of the center of troughs of magnetic field intensity, which corresponds to the maxima of ion pressure in the compressional ULF wave. This result is consistent with the idea that the EMIC wave generation is modulated by ULF waves, and preferential locations for the cyclotron resonant energy transfer are the troughs of magnetic field intensity. In these troughs, relatively low resonance velocity due to the lower magnetic field intensity and the enhanced hot proton flux likely contribute to the enhanced energy transfer from hot protons to the EMIC waves by cyclotron resonance. Due to the compressional ULF wave, regions of the cyclotron resonant energy transfer can be narrow (only a few times of the gyroradii of hot resonant protons) in magnetic local time.

Published
2021
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39. Data‐Driven Simulation of Rapid Flux Enhancement of Energetic Electrons With an Upper‐Band Whistler Burst

Author

Masafumi Shoji, Shinji Saito, Shun Imajo, S. Kurita, Shoichiro Yokota, Kunihiro Keika, Ayako Matsuoka, Satoko Nakamura, Satoshi Kasahara, Iku Shinohara, Yoshiya Kasahara, Shoya Matsuda, Yoshizumi Miyoshi, and Tomoaki Hori

Subjects
Physics, 010504 meteorology & atmospheric sciences, Whistler, Astrophysics::High Energy Astrophysical Phenomena, Cyclotron, Flux, Electron, 01 natural sciences, Computational physics, law.invention, Geophysics, Physics::Plasma Physics, Space and Planetary Science, Electron flux, law, Physics::Space Physics, Whistler mode, 0105 earth and related environmental sciences
Abstract

The temporal variation of the energetic electron flux distribution caused by whistler mode chorus waves through the cyclotron resonant interaction provides crucial information on how electrons are ...

Published
2021
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40. Over‐Darkening of Pulsating Aurora

Author

S. Kurita, Shoya Matsuda, Takeshi Takashima, Satoshi Yagitani, Iku Shinohara, Yoshiya Kasahara, M. Ozaki, Yasunobu Ogawa, Fuminori Tsuchiya, Shin-ichiro Oyama, R. Fujii, Atsushi Kumamoto, Yoshizumi Miyoshi, Yasumasa Kasaba, and Keisuke Hosokawa

Subjects
Physics, Geophysics, Space and Planetary Science
Published
2021
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41. Multi‐Event Analysis of Plasma and Field Variations in Source of Stable Auroral Red (SAR) Arcs in Inner Magnetosphere During Non‐Storm‐Time Substorms

Author

Masafumi Shoji, Shin-ichiro Oyama, John W. Bonnell, Yasumasa Kasaba, Fuminori Tsuchiya, Shoichiro Yokota, John Wygant, Shun Imajo, T. F. Chang, Ayako Matsuoka, Yoshizumi Miyoshi, Martin Connors, M. Kitahara, Ian Schofield, Charles W. Smith, Yudai Inaba, Iku Shinohara, Kazushi Asamura, Kazuo Shiokawa, Yuichi Otsuka, Robert J. MacDowall, Shoya Matsuda, Shiang-Yu Wang, Yoichi Kazama, Geoff Reeves, Yoshiya Kasahara, Bo Jhou Wang, Sunny W. Y. Tam, Tomoaki Hori, Atsuki Shinbori, Satoshi Kasahara, Atsushi Kumamoto, Satoko Nakamura, Harlan E. Spence, Kunihiro Keika, and Artem Gololobov

Subjects
Physics, Multi event, Geophysics, Field (physics), Space and Planetary Science, Magnetosphere, Storm, Plasmasphere, Plasma, Ring current
Published
2021
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42. Investigation of Small‐Scale Electron Density Irregularities Observed by the Arase and Van Allen Probes Satellites Inside and Outside the Plasmasphere

Author

Shoichiro Yokota, Neethal Thomas, Sunny W. Y. Tam, Shiang-Yu Wang, Yoichi Kazama, Bo Jhou Wang, Yoshizumi Miyoshi, Ayako Matsuoka, Iku Shinohara, T. F. Chang, A. W. Breneman, Fuminori Tsuchiya, Tomoaki Hori, Kunihiro Keika, Kazushi Asamura, Yoshiya Kasahara, Satoshi Kasahara, Atsushi Kumamoto, Kazuo Shiokawa, John Wygant, and Geoffrey D. Reeves

Subjects
Physics, Electron density, Geophysics, Scale (ratio), Space and Planetary Science, Plasmasphere, Van Allen Probes, Computational physics
Published
2021
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43. Multievent Study of Characteristics and Propagation of Naturally Occurring ELF/VLF Waves Using High‐Latitude Ground Observations and Conjunctions With the Arase Satellite

Author

Masafumi Shoji, Jyrki Manninen, Mariko Teramoto, Kazuo Shiokawa, Fuminori Tsuchiya, Claudia Martinez-Calderon, Ondřej Santolík, Yuto Katoh, Iku Shinohara, Yoshiya Kasahara, Ayako Matsuoka, Shoya Matsuda, Atsushi Kumamoto, and Yoshizumi Miyoshi

Subjects
Physics, geography, Geophysics, Erg (landform), geography.geographical_feature_category, Space and Planetary Science, High latitude, Satellite
Published
2021
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44. Study of Spatiotemporal Development of Global Distribution of Magnetospheric ELF/VLF Waves Using Ground‐Based and Satellite Observations, and RAM‐SCB Simulations, for the March and November 2017 Storms

Author

Yoshiya Kasahara, Kazuo Shiokawa, Dmitry Baishev, Martin Connors, Mitsunori Ozaki, Jyrki Manninen, A. V. Oinats, Shin-ichiro Oyama, Yoshizumi Miyoshi, Yuhei Takeshita, Vladimir Kurkin, and Vania K. Jordanova

Subjects
Physics, Geophysics, Meteorology, Space and Planetary Science, Global distribution, Van Allen Probes, Storm, Satellite
Published
2021
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45. Development of space environment customized risk estimation for satellites (SECURES)

Author

Kiyokazu Koga, Haruhisa Matsumoto, Tsutomu Nagatsuma, Aoi Nakamizo, Yasubumi Kubota, Masao Nakamura, and Yoshizumi Miyoshi

Subjects
Space weather forecasting, 010504 meteorology & atmospheric sciences, lcsh:Geodesy, Magnetosphere, Space weather, 01 natural sciences, 010305 fluids & plasmas, Spacecraft charging, symbols.namesake, Geospace, Customized risk estimation, 0103 physical sciences, Satellite charging, Aerospace engineering, Physics::Atmospheric and Oceanic Physics, 0105 earth and related environmental sciences, lcsh:QB275-343, business.industry, Anomaly (natural sciences), lcsh:QE1-996.5, lcsh:Geography. Anthropology. Recreation, Geosynchronous orbit, Geology, lcsh:Geology, Satellite anomaly, lcsh:G, Space and Planetary Science, Van Allen radiation belt, Physics::Space Physics, symbols, Satellite, business, Space environment
Abstract

形態: カラー図版あり, Physical characteristics: Original contains color illustrations, Accepted: 2021-01-04, 資料番号: PA2110062000

Published
2021
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46. Inner Magnetospheric Response to the Interplanetary Magnetic Field B y Component: Van Allen Probes and Arase Observations

Author

Mariko Teramoto, Adrian Grocott, David Hartley, S. Kurita, Ayako Matsuoka, Shun Imajo, Iku Shinohara, Nathan Case, and Yoshizumi Miyoshi

Subjects
Physics, 010504 meteorology & atmospheric sciences, Spacecraft, business.industry, Field line, Geosynchronous orbit, Magnetosphere, Astrophysics, 01 natural sciences, Magnetic field, Geophysics, Space and Planetary Science, Physics::Space Physics, Van Allen Probes, Interplanetary magnetic field, business, 0105 earth and related environmental sciences
Abstract

We utilise 17 years of combined Van Allen Probes and Arase data to statistically analyse the response of the inner magnetosphere to the orientation of the IMF By component. Past studies have demonstrated that the IMF By component introduces a similarly oriented By component into the magnetosphere. However, these studies have tended to focus on field lines in the magnetotail only reaching as close to Earth as geosynchronous orbit. By exploiting data from these inner magnetospheric spacecraft, we have been able to investigate the response at radial distances of < 7 RE. When subtracting the background magnetic field values, provided by the T01 and IGRF magnetic field models, we find that the IMF By component does affect the configuration of the magnetic field lines in the inner magnetosphere. This control is observed throughout the inner magnetosphere, across both hemispheres, all radial distances, and all MLT sectors. The ratio of IMF By to observed By residual, also known as the "penetration efficiency", is found to be ~0.33. The IMF Bz component is found to increase, or inhibit, this control depending upon its orientation.

Published
2021
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47. BepiColombo science investigations during cruise and flybys at the Earth, Venus and Mercury

Author

Jean Yves Chaufray, Rami Vainio, Daniel Heyner, Wolfgang Baumjohann, J. Zhong, Roberto Peron, Stefano Orsini, Yoshifumi Saito, A. S. Kozyrev, Kazumasa Iwai, Géza Erdős, Ferdinand Plaschke, Masanori Kobayashi, Francesco Santoli, Dusan Odstrcil, Yasumasa Kasaba, Thomas Cornet, Yeon Joo Lee, Bernard V. Jackson, Johannes Benkhoff, Marco Lucente, Stavro Ivanovski, Richard Moissl, Juhani Huovelin, Elsa Montagnon, A. Varsani, Riku Jarvinen, Sebastien Besse, Alessandro Maturilli, Melinda Dósa, James A. Slavin, Harald Hiesinger, Jörn Helbert, Yoshizumi Miyoshi, Francesco Quarati, Anna Milillo, Ákos Madár, Gunther Laky, Stefano Massetti, Emilia Kilpua, Takayuki Hirai, Davide Grassi, I. G. Mitrofanov, Go Murakami, Harald Krüger, Chuanfei Dong, Eric Quémerais, Sara de la Fuente, Stas Barabash, Markus Fränz, Joe Zender, Luciano Iess, Tommaso Alberti, V. Mangano, Susan McKenna-Lawlor, Carl Schmidt, Martin Volwerk, J. S. Oliveira, Sae Aizawa, Herbert Lichtenegger, Denis Belyaev, Christina Plainaki, National Institute for Astrophysics, Hungarian Academy of Sciences, Max Planck Institute for Solar System Research, European Space Research and Technology Centre, Technical University of Berlin, Space Technology Ireland, Ltd., Technical University of Braunschweig, Space Research Institute of the Russian Academy of Sciences, German Aerospace Center, European Space Astronomy Centre, European Space Agency - ESA, European Space Operation Centre, Austrian Academy of Sciences, Université de Versailles Saint-Quentin-en-Yvelines, University of Michigan, Ann Arbor, Nagoya University, Boston University, United States Department of Energy, Delft University of Technology, Chiba Institute of Technology, Chinese Academy of Sciences, University of Helsinki, University of California, George Mason University, University of Turku, Esa Kallio Group, Osservatorio Astronomico di Trieste, Agenzia Spaziale Italiana, IRAP, JAXA Institute of Space and Astronautical Science, University of Münster, Sapienza University of Rome, Uppsala University, Tohoku University, Department of Electronics and Nanoengineering, Aalto-yliopisto, Aalto University, Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), Istituto Nazionale di Astrofisica (INAF), Wigner Research Centre for Physics [Budapest], Hungarian Academy of Sciences (MTA), Max-Planck-Institut für Sonnensystemforschung (MPS), Max-Planck-Gesellschaft, European Space Research and Technology Centre (ESTEC), European Space Agency (ESA), Zentrum für Astronomie und Astrophysik [Berlin] (ZAA), Technische Universität Berlin (TU), Space Technology Ireland Limited, Institut für Geophysik und Extraterrestrische Physik [Braunschweig] (IGEP), Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig], Space Research Institute of the Russian Academy of Sciences (IKI), Russian Academy of Sciences [Moscow] (RAS), DLR Institut für Planetenforschung, Deutsches Zentrum für Luft- und Raumfahrt [Berlin] (DLR), Operations Department (ESAC), European Space Astronomy Centre (ESAC), European Space Agency (ESA)-European Space Agency (ESA), European Space Operations Center (ESOC), Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), HELIOS - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Department of Climate and Space Sciences and Engineering (CLaSP), University of Michigan [Ann Arbor], University of Michigan System-University of Michigan System, Institute for Space-Earth Environmental Research [Nagoya] (ISEE), Boston University [Boston] (BU), Princeton Plasma Physics Laboratory (PPPL), Princeton University, Department of Radiation Science and Technology [Delft] (RST), Delft University of Technology (TU Delft), Planetary Exploration Research Center [Chiba] (PERC), Chiba Institute of Technology (CIT), Institute of Geology and Geophysics [Beijing] (IGG), Chinese Academy of Sciences [Beijing] (CAS), Center for Astrophysics and Space Sciences [La Jolla] (CASS), University of California [San Diego] (UC San Diego), University of California-University of California, Department of Physics [Helsinki], Falculty of Science [Helsinki], University of Helsinki-University of Helsinki, Department of Physics and Astronomy [Turku], Finnish Meteorological Institute (FMI), Department of Electronics and Nanoengineering [Espoo], School of Electrical Engineering [Aalto Univ], Aalto University-Aalto University, INAF - Osservatorio Astronomico di Trieste (OAT), National and Kapodistrian University of Athens (NKUA), 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), Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency [Sagamihara] (JAXA), Institut für Planetologie [Münster], Westfälische Wilhelms-Universität Münster (WWU), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Dipartimento di Ingegneria Meccanica e Aerospaziale [Roma La Sapienza] (DIMA), Swedish Institute of Space Physics [Uppsala] (IRF), Planetary Plasma and Atmospheric Research Center [Sendai] (PPARC), Tohoku University [Sendai], European Project: 8414322(1984), Department of Physics, Space Physics Research Group, Oliveira, J. S. [0000-0002-4587-2895], Dong, C. [0000-0002-8990-094X], Thomas, F. [0000-0001-5971-0056], Miyoshi, Y. [0000-0001-7998-1240], Vainio, R. [0000-0002-3298-2067], Lee, Y. J. [0000-0002-4571-0669], Zhong, J. [0000-0003-4187-3361], Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), Agence Spatiale Européenne = European Space Agency (ESA), Technical University of Berlin / Technische Universität Berlin (TU), Agence Spatiale Européenne = European Space Agency (ESA)-Agence Spatiale Européenne = European Space Agency (ESA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), University of California (UC)-University of California (UC), Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Westfälische Wilhelms-Universität Münster = University of Münster (WWU), and Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA)

Subjects
solar system exploration, space navigation, space telecommunications, spacecraft tracking systems, aerospace engineering, planetary science, 010504 meteorology & atmospheric sciences, BepiColombo, Cruise, Planetare Labore, Venus, 01 natural sciences, Astrobiology, Planet, 0103 physical sciences, Aerospace, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, MERTIS, biology, Spacecraft, business.industry, Astronomy and Astrophysics, Earth, Mercury, biology.organism_classification, 115 Astronomy, Space science, Bepicolombo, Planetary science, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Environmental science, Flyby, Orbit insertion, business, Heliosphere
Abstract

The dual spacecraft mission BepiColombo is the first joint mission between the European Space Agency (ESA) and the Japanese Aerospace Exploration Agency (JAXA) to explore the planet Mercury. BepiColombo was launched from Kourou (French Guiana) on October 20th, 2018, in its packed configuration including two spacecraft, a transfer module, and a sunshield. BepiColombo cruise trajectory is a long journey into the inner heliosphere, and it includes one flyby of the Earth (in April 2020), two of Venus (in October 2020 and August 2021), and six of Mercury (starting from 2021), before orbit insertion in December 2025. A big part of the mission instruments will be fully operational during the mission cruise phase, allowing unprecedented investigation of the different environments that will encounter during the 7-years long cruise. The present paper reviews all the planetary flybys and some interesting cruise configurations. Additional scientific research that will emerge in the coming years is also discussed, including the instruments that can contribute. Open Access funding provided by Istituto Nazionale di Astrofisica within the CRUI-CARE Agreement. Peerreview

Published
2021
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49. First Direct Observations of Propagation of Discrete Chorus Elements From the Equatorial Source to Higher Latitudes, Using the Van Allen Probes and Arase Satellites

Author

Cynthia A Cattell, Mitsuru Hikishima, Craig Kletzing, Jean-Francois Ripoll, Yoshizumi Miyoshi, Gian Luca Delzanno, John Wygant, Aaron Breneman, C. A. Colpitts, Ayako Matsuoka, Yoshiya Kasahara, G. S. Cunningham, Shoya Matsuda, Yuto Katoh, and Iku Shinohara

Subjects
Physics, symbols.namesake, Geophysics, biology, Space and Planetary Science, Van Allen radiation belt, symbols, Chorus, Astronomy, Van Allen Probes, biology.organism_classification, Latitude
Published
2020
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50. Two‐Dimensional Hybrid Particle‐in‐Cell Simulations of Magnetosonic Waves in the Dipole Magnetic Field: On a Constant L ‐Shell

Author

Scott A. Boardsen, Kyungguk Min, Richard E. Denton, Kaijun Liu, Yoshizumi Miyoshi, and František Němec

Subjects
Physics, Surface (mathematics), Generation process, Nuclear Theory, Shell (structure), Molecular physics, L-shell, Magnetic field, Dipole, Geophysics, Space and Planetary Science, Physics::Atomic and Molecular Clusters, Particle-in-cell, Constant (mathematics)
Abstract

Two-dimensional hybrid particle-in-cell (PIC) simulations are carried out on a constant L-shell (or drift shell) surface of the dipole magnetic field to investigate the generation process of near-e...

Published
2020
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