Articles | Volume 24, issue 10
https://doi.org/10.5194/angeo-24-2435-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.Eigenmode stability analysis of drift-mirror modes in nonuniform plasmas
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.