Drift anisotropy instability of a finite-beta magnetospheric plasma

Details Drift anisotropy instability of a finite-beta magnetospheric plasma Drift anisotropy instability of a finite-beta magnetospheric plasma

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33.1229p&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Nov. 1985, p. 1229-1241.

Computer Science

36

Geomagnetic Pulsations, Magnetohydrodynamic Stability, Magnetospheric Instability, Plasma Drift, Space Plasmas, Anisotropy, Geos 2 Satellite, Magnetohydrodynamic Waves, Radar Data, Tensors, Wave Excitation

Scientific paper

A unified theory of low frequency instabilities in a two component (cold and hot) finite-beta magnetospheric plasma is suggested. It is shown that the low frequency oscillations comprise two wave modes: compressional Alfven and drift mirror mode. No significant coupling between them is found in the long-wave approximation. Instabilities due to spontaneous excitation of these oscillations are considered. It is found that the temperature anisotropy significantly influences the instability growth rate at low frequency. A new instability due to the temperature anisotropy and density gradient appears when the frequency of compressional Alfven waves is close to the drift mirror mode frequency. The theoretical predictions are compared in detail with the Pc5 event of Oct. 27, 1978 observed simultaneously by the GEOS 2 satellite and the STARE radar facility. It is shown that the experimental results can be interpreted in terms of a compressional Alfven wave driven by the drift anisotropy instability.

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