Slow drift mirror kinetic instability at a finite electron temperature in a nonmaxwellian space plasma

A slow drift mirror (SDM) instability has been analyzed in the scope of kinetic approximation, with accounting for the electron pressure for different particle distribution functions. The dependence of the SDM instability increment growth rate on the parameters of the anisotropic κ distribution with...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2014-11, Vol.54 (6), p.727-734
Main Authors: Feygin, F. Z., Khabazin, Yu. G.
Format: Article
Language:English
Subjects:
Anisotropy
Approximation
Astrophysics
Drift
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Instability
Ion distribution
Kinetics
Mathematical analysis
Mathematical models
Plasma
Space plasmas
Stability
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Summary:A slow drift mirror (SDM) instability has been analyzed in the scope of kinetic approximation, with accounting for the electron pressure for different particle distribution functions. The dependence of the SDM instability increment growth rate on the parameters of the anisotropic κ distribution with the loss cone, which is used to model real space plasma particle distributions, has been studied. An analysis indicated that the appearance of the loss cone in the ion distribution function results in a decrease in the SDM mode frequency, and an enhancement of the suprathermal tail (a decrease in κ) increases the SDM mode frequency as compared to the Maxwellian distribution. In other words, particle redistribution from the region of low velocities into that of high velocities results in an increase in the SDM mode frequency.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793214060103