FINITE LARMOR RADIUS AND HALL-EFFECTS ON THERMAL-INSTABILITY OF A PLASMA IN POROUS-MEDIUM

The thermal instability of a plasma in a porous medium in the presence of a finite Larmor radius (FLR) and Hall effects is considered. Oscil latory modes due to the presence of a magnetic field (and hence the pr esence of FLR and Hall effects) are introduced. For stationary convect ion, the FLR may have a stabilizing or destabilizing effect, but a com pletely stabilizing one for a certain wave-number range. Similarly, th e Hall currents may have a stabilizing or destabilizing effect but a c ompletely stabilizing one for the same wave-number range under certain condition, whereas the medium permeability always has a destabilizing effect for stationary convection.