Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8910771l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 1, 1984, p. 10771-10778.
Physics
5
Geomagnetic Tail, Magnetospheric Instability, Plasma Drift, Space Plasmas, Field Strength, Geomagnetic Pulsations, Kinetic Equations, Wave Dispersion
Scientific paper
The effects of geomagnetic tail fields on drift mirror instability are studied for a magnetic field model that contains a magnetic gradient and a tail field perpendicular to an ambient field. The magnetospheric plasma is assumed to consist of a cold component and a high beta anisotropic inhomogeneous component. The gyrokinetic equations are used to derive the dispersion equation including the effects of magnetic gradient and curvature drifts. The dispersion equation is solved locally for wave frequencies less than the ion gyrofrequency. The numerical results indicate that the instability growth rate decreases when the tail field strength increases. The drift mirror instability is found to be stabilized when larger tail fields require a smaller pressure anisotropy and a smaller plasma beta-perpendicular to maintain equilibrium. The theoretical results are used to explain the GOES satellite observations that storm time Pc 5 waves occur less frequently during periods of large tail fields.
Cheng C. Z.
Lin Chang-Shou
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