Hall effects on thermal hydromagnetic instability of a partially ionized medium |
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| Authors: | K C Sharma Sushma Sharma |
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| Institution: | (1) Department of Mathematics, Himachal Pradesh University, Simla, India;(2) Department of Bio-Sciences, H.P. University, Simla, India |
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| Abstract: | Thermal instability of a finitely conducting hydromagnetic composite medium is considered including the effects of Hall currents and the collisions with neutrals. The equilibrium magnetic field is assumed to be uniform and vertical. For stationary convection, the collissions have no effect, while the Hall currents are found to have a destabilizing effect on the thermal instability. It is further shown that whenM is finite andQ  the asymptotic behaviours of the critical Rayleigh number, the critical wave number and the critical temperature gradient remain the same as those obtained by Chandrasekhar whereM is a nondimensional number which includes the Hall current effects andQ stands for the Chandrasekhar number. |
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