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Your search keyword '"Horbury, T.S."' showing total 3 results
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3 results on '"Horbury, T.S."'

1. Solitary Waves Observed By Cluster In the Solar Wind.

Author

Fränz, M., Horbury, T.S., Génot, V., Moullard, O., Rème, H., Dandouras, I., Fazakerley, A.N., Korth, A., and Frutos-Alfaro, F.

Subjects
*SOLITONS, *SOLAR wind, *MAGNETIC fields, *PLASMA instabilities
Abstract

Short dropouts of the magnetic field intensity have been frequently observed in the solar wind on interplanetary spacecraft. But so far it could not be established whether these are caused by kinetic instabilities or whether they can be described as solitary MHD waves. The multi-satellite observations of the Cluster-mission allow for the first time to measure proton and electron distributions with a sufficient temporal and spatial resolution to tackle this question. We use measurements by the FGM magnetometer, the CIS ion spectrometer, the PEACE electron instrument and the Whisper plasma wave instrument to investigate the role of protons, heavy ions and electrons for the stability of the structures. We also use the 4-satellite observations of the Cluster magnetic field instrument to determine the proper motion of these structures relative to the solar wind. The presence of foreshock waves close to the Earth bowshock strongly limits the event selection. In the current paper we discuss a 10 s linear wave without sufficient particle data resolution and a 4 min wave for which particle distributions are available. The larger wave shows that the stability of the structure might be caused by changes in the thermal electron distributions while proton and α distributions are unaffected. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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2. Global impacts of a Foreshock Bubble: Magnetosheath, magnetopause and ground-based observations.

Author

Archer, M.O., Turner, D.L., Eastwood, J.P., Schwartz, S.J., and Horbury, T.S.

Subjects
*MAGNETOPAUSE, *PLANETARY magnetospheres, *BOW shock (Astrophysics), *EARTH (Planet), *CURRENT sheets, *SPACE sciences
Abstract

Using multipoint observations we show, for the first time, that Foreshock Bubbles (FBs) have a global impact on Earth׳s magnetosphere. We show that an FB, a transient kinetic phenomenon due to the interaction of backstreaming suprathermal ions with a discontinuity, modifies the total pressure upstream of the bow shock showing a decrease within the FB׳s core and sheath regions. Magnetosheath plasma is accelerated towards the intersection of the FB׳s current sheet with the bow shock resulting in fast, sunward, flows as well as outward motion of the magnetopause. Ground-based magnetometers also show signatures of this magnetopause motion simultaneously across at least 7 h of magnetic local time, corresponding to a distance of 21.5 R E transverse to the Sun–Earth line along the magnetopause. These observed global impacts of the FB are in agreement with previous simulations and in stark contrast to the known localised, smaller scale effects of Hot Flow Anomalies (HFAs). [ABSTRACT FROM AUTHOR]

Published
2015
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3. The fluxgate magnetometer of the BepiColombo Mercury Planetary Orbiter

Author

Glassmeier, K.-H., Auster, H.-U., Heyner, D., Okrafka, K., Carr, C., Berghofer, G., Anderson, B.J., Balogh, A., Baumjohann, W., Cargill, P., Christensen, U., Delva, M., Dougherty, M., Fornaçon, K.-H., Horbury, T.S., Lucek, E.A., Magnes, W., Mandea, M., Matsuoka, A., and Matsushima, M.

Subjects
*FLUXGATE magnetometers, *SPACE flight to Mercury, *COSMIC magnetic fields, *DETECTORS, *PLANETARY magnetospheres, *SPACE vehicle orbits, *MERCURIAN atmosphere, *MERCURY (Planet)
Abstract

Abstract: The magnetometer (MAG) on the Mercury Planetary Orbiter (MPO) of the joint European–Japanese BepiColombo mission to planet Mercury is a low-noise, tri-axial, dual-sensor, digital fluxgate instrument with its sensors mounted on a 2.8-m-long boom. The primary MPO/MAG science objectives are to determine the spatial and temporal structure of the magnetic field in the Hermean system, in particular the structure and origin of the intrinsic magnetic field of Mercury. MPO/MAG has a dynamic measurement range of with a resolution of 2pT during operation along the near-polar orbit of the MPO spacecraft around Mercury. MPO/MAG is designed to provide measurements with rates between 0.5 and 128vectors/s. In cooperation with its sister magnetometer instrument, MMO/MGF on board the BepiColombo Mercury Magnetospheric Orbiter (MMO), MPO/MAG will be able to distinguish between temporal and spatial magnetic field variations in the magnetically closely coupled Hermean system. [Copyright &y& Elsevier]

Published
2010
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