Journal
ANNALES GEOPHYSICAE
Volume 27, Issue 2, Pages 861-868Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-27-861-2009
Keywords
Magnetospheric physics; Magnetotail; Space plasma physics; Numerical simulation
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Funding
- RF Presidential Program for State Support of Leading Scientific Schools [NSh-472.2008.2]
- Russian Foundation for Basic Research [08-02-00407, 06-05-90631, 07-02-00319]
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The eigenmodes of low frequency perturbations of thin anisotropic current sheets with a finite value of the normal magnetic field, are investigated in this paper. It is shown that two possible polarizations of symmetric and asymmetric modes (sausage and kink) exist where the growth rate of instabilities is positive. In addition, we demonstrate that a tearing instability might have a positive growth rate in thin anisotropic current sheets. The class of relatively fast wavy flapping oscillations observed by Cluster is described. The main direction of wave motion coincides with the direction of the current and the typical velocity of this motion is comparable with the plasma drift velocity in the current sheet. The comparison of these characteristics with theoretical predictions of the model of anisotropic thin current sheets, demonstrates that, in principle, the theory adequately describes the observations.
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