Astrophysics and Space Science

, Volume 112, Issue 2, pp 391–395 | Cite as

Hall effects on thermal hydromagnetic instability of a partially ionized medium

  • K. C. Sharma
  • Sushma Sharma
Article

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.

Keywords

Convection Temperature Gradient Asymptotic Behaviour Critical Temperature Rayleigh Number 

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Copyright information

© D. Reidel Publishing Company 1985

Authors and Affiliations

  • K. C. Sharma
    • 1
  • Sushma Sharma
    • 1
    • 2
  1. 1.Department of MathematicsHimachal Pradesh UniversitySimlaIndia
  2. 2.Department of Bio-SciencesH.P. UniversitySimlaIndia

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