Drift compressional instability in the magnetosphere

Details Drift compressional instability in the magnetosphere Drift compressional instability in the magnetosphere

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8910763n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 1, 1984, p. 10763-10769.

Physics

9

Compression Waves, Earth Magnetosphere, Magnetospheric Instability, Plasma Drift, Space Plasmas, Kinetic Equations, Magnetic Dipoles, Plasma Slabs, Wave Dispersion

Scientific paper

The properties of the drift compressional instability in the magnetosphere with a two-component plasma are examined by using gyrokinetic theory. A dipole field is used to approximate the equilibrium geomagnetic field. In contrast to the slab model it is found that electrons of the hot component have a stabilizing effect on the mode excited by the protons. With appropriate values of various parameters, the wave periods in the range of 30-200 s are obtained from numerical calculations of the model. The drift compressional instability may provide possible explanation of the compressional waves observed in the magnetosphere.

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