Physics – Plasma Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10909213p&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue A9, CiteID A09213
Physics
Plasma Physics
36
Space Plasma Physics: Waves And Instabilities, Space Plasma Physics: Turbulence, Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Mhd Waves And Instabilities
Scientific paper
A fully kinetic theory of the magnetic mirror instability in high-β space plasmas accounting for arbitrary ion-Larmor radius effects is developed. It is shown that incorporation of ion-Larmor radius effects leads to a substantial modification of both the instability growth rate and the instability threshold. For wavelengths of the order of the ion-Larmor radius the effective elasticity of the magnetic field lines is substantially enhanced, yielding an increase in the instability threshold. We derive a compact expression for the growth rate of the fastest-growing mode in the fully kinetic limit. Furthermore, it is shown that in the presence of finite ion-Larmor radius effects a noncoplanar component of the magnetic field perturbations appears. Such a component is usually present in satellite measurements of mirror modes. The relevance of these results in understanding observations of mirror instability-generated signals in space plasmas is outlined.
Balikhin Michael A.
Pokhotelov Oleg A.
Sagdeev Roal'd. Z.
Treumann Rudolf A.
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