Drift anisotropy instability of a finite β magnetospheric plasmaстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация: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.