Finite Larmor radius effect on thermal instability of a compressible rotating plasma

Astronomy and Astrophysics – Astrophysics

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Compressible Fluids, Larmor Radius, Magnetohydrodynamic Stability, Rotating Plasmas, Thermal Instability, Coriolis Effect, Free Convection, Magnetic Field Configurations, Plasma Interactions

Scientific paper

Thermal instability of a compressible rotating plasma in the presence of a uniform vertical magnetic field is studied to include the effects of finiteness of the ion-Larmor radius. When the instability sets in as stationary convection, the compressibility is found to have stabilizing effect. It is found that finite Larmor radius effects are always stabilizing for x greater than 2 and for x less than 2 they have a destabilizing influence in the presence of rotation. The stabilizing effect of Coriolis force is observed and for the case of no rotation, finite Larmor radius effects are always stabilizing. The sufficient conditions for the nonexistence of overstability are investigated.

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