Abstract
The thermal instability of electrically conducting micropolar fluids heated from below in the presence of uniform vertical magnetic field in porous medium has been considered. It is found that the presence of coupling between thermal and micropolar effects, magnetic field and permeability may introduce oscillatory motions in the system. The increase in Rayleigh number for stationary convection and decrease in Rayleigh number for overstability with the increase in magnetic field is depicted graphically. Also the Rayleigh number is found to decrease with the increase in permeability.
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