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Thermosolutal instability of compressible hall plasma in porous medium

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Abstract

The thermosolutal instability of a plasma in porous medium in the presence of a vertical magnetic field is considered to include the effects of compressibility and Hall currents. The effects of stable solute gradient and compressibility are found to be stabilizing and the Hall currents have a destabilizing effect. The system is stable for (C p/g)β<1;C p, β, andg denoting specific heat at constant pressure, uniform temperature gradient, and acceleration due to gravity, respectively. In contrast to the non-oscillatory modes in the absence of magnetic field and stable solute gradient, the presence of magnetic field (and, hence, Hall currents) and stable solute gradient introduce oscillatory modes for (C p/g)β>1. The case of overstability is also studied wherein the necessary conditions for the existence of overstability are obtained.

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Author notes

  1. R. C. Sharma

    Present address: Department of Physics, University of Alberta, T6G 2J1, Edmonton, Canada

Authors and Affiliations

  1. Department of Mathematics, Himachal Pradesh University, Shimla, India

    R. C. Sharma & Trilok Chand

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  1. R. C. Sharma
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  2. Trilok Chand
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Sharma, R.C., Chand, T. Thermosolutal instability of compressible hall plasma in porous medium. Astrophys Space Sci 155, 301–310 (1989). https://doi.org/10.1007/BF00643866

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  • DOI: https://doi.org/10.1007/BF00643866

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