Low-frequency waves and instabilities in stratified, gyrotropic plasmas with arbitrary distribution functions

Details Low-frequency waves and instabilities in stratified, gyrotropic plasmas with arbitrary distribution functions Low-frequency waves and instabilities in stratified, gyrotropic plasmas with arbitrary distribution functions

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11012201f&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A12, CiteID A12201

Physics

3

Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Planetary Sciences: Solid Surface Planets: Magnetospheres (2756), Planetary Sciences: Fluid Planets: Magnetospheres (2756), Planetary Sciences: Comets And Small Bodies: Magnetic Fields And Magnetism

Scientific paper

We study the nature and stability of low-frequency waves in collisionless, gyrotropic (P$\perp$ ≠ P$\parallel$), multi-component plasmas, characterized by arbitrary distribution functions. The ambient medium is assumed to be stratified perpendicular to the magnetic field, with a scale height much larger than the wavelength of our waves, and the whole system is allowed to rotate. We show that the waves are generally non-adiabatic, and we identify the four physical causes of their non-adiabatic behavior. We also derive a global necessary condition for stability, which, quite remarkably, consists of the simple superposition of a criterion against instabilities triggered by thermal pressure anisotropies and a criterion against instabilities triggered by stratification. In the case of a nonrotating bi-Maxwellian plasma, our stability condition turns out to be not only necessary, but also sufficient.

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