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Ann. Geophys., 24, 2435-2439, 2006
www.ann-geophys.net/24/2435/2006/
© European Geosciences Union 2006
Eigenmode stability analysis of drift-mirror modes in nonuniform plasmas
D. Yu. Klimushkin1 and L. Chen2,3
1Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Irkutsk, P.O. Box 4026, 664033, Russia
2Department of Physics and Astronomy, University of California Irvine, Irvine, CA 92697-4575, USA
3Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, China
Abstract. Drift-mirror modes in a one-dimensional inhomogeneous model of the magnetosphere are studied by employing
gyrokinetics,
taking into account finite Larmor radius effects. A wave equation is derived which describes both the spatial
structure of the modes, and its eigenvalue yields a growth rate of the mode. The finite Larmor radius effects are
shown to raise the instability threshold especially for high-m waves, and lead to wave propagation across field
lines.
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