Excitation of high-beta plasma instabilities at the geostationary orbit - Theory and observations

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Geosynchronous Orbits, Magnetohydrodynamic Stability, Space Plasmas, Distribution Functions, Geomagnetic Micropulsations, Geos 2 Satellite, Lines Of Force, Magnetic Storms

Scientific paper

The general theory of low frequency plasma instabilities is developed for a plasma consisting of a cold component and a hot high beta component. The results of Pokhotelov et al. (1985) are generalized to the case of an arbitrary distribution function and to the case of curved magnetic field lines. The theoretical predictions are compared with experimental data from the geostationary satellite Geos 2 for two Pc5 storm-related events, showing that the plasma anisotropy during these events was not high enough to excite either the drift mirror instability or the drift anisotropy instability. It is suggested that Geos 2 was on the inner edge of the ring current close to its maximum.

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