THE STABILITY OF PLASMA DISKS IN MAGNETOS PHERES OF HOT DEGENERATE STARS AND ROTATING PLANETS

The magnetohydrodynamic stability of dense plasma disks in the magneto spheres of hot white dwarfs and rotating planets was investigated. The equilibrium radial distribution of plasma concentration was found for plasma disks at the threshold of the instability with respect to smal l-scale MHD-perturbations. The effects of finite ion Larmor radius and inhomogeneity of the perturbations along the magnetic field on the ra dial concentration profile were taken into account. The influence of f inite thickness of the plasma disk on the plasma distribution over the magnetic shells was studied. The results obtained were compared with the experimental data for the Jovian plasma sheet.