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Shear driven waves in the induced magnetosphere of Mars

H. Gunell 1 U. V. Amerstorfer 2, 3 Hans Nilsson 4 Cyril Grima 5 M. Koepke 1 M. Franz 6 J. Winningham 7 R. A. Frahm 7 J.-A. Sauvaud 8 A. Fedorov 8 N. V. Erkaev 9 H. K. Biernat 2, 3 M. Holmström 4 R. Lundin 4 S. Barabash 4 
1 Department of Physics [Morgantown}
2 IWF - Space Research Institute of Austrian Academy of Sciences
3 Institute of Physics
4 IRF - Swedish Institute of Space Physics [Uppsala]
5 LPG - Laboratoire de Planétologie de Grenoble
6 MPS - Max-Planck-Institut für Sonnensystemforschung
7 Space Science and Engineering Division [San Antonio]
8 CESR - Centre d'étude spatiale des rayonnements
9 Institute of Computational Modelling
Abstract : We present measurements of oscillations in the electron density, ion density and ion velocity in the induced magnetosphere of Mars. The fundamental frequency of the oscillations is a few millihertz, but higher harmonics are present in the spectrum. The oscillations are observed in a region where there is a velocity shear in the plasma flow. The fundamental frequency is in agreement with computational results from an ideal-MHD model. An interpretation based on velocity-shear instabilities is described.
Keywords : SOLAR-WIND INTERACTION KELVIN-HELMHOLTZ INSTABILITY MARTIAN ATMOSPHERE VELOCITY SHEAR VENUS PLASMA MHD IONOPAUSE SIMULATIONS BOUNDARY
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Submitted on : Wednesday, February 11, 2009 - 11:53:48 AM
Last modification on : Monday, July 4, 2022 - 10:23:47 AM

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H. Gunell, U. V. Amerstorfer, Hans Nilsson, Cyril Grima, M. Koepke, et al.. Shear driven waves in the induced magnetosphere of Mars. Plasma Physics and Controlled Fusion, IOP Publishing, 2008, 50 (7), pp.074018. ⟨10.1088/0741-3335/50/7/074018⟩. ⟨insu-00360495⟩

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