Gravitational instability in isotropic MHD plasma waves

  • Alemayehu Mengesha Cherkos


The effect of compressive viscosity, thermal conductivity and radiative heat-loss functions on the gravitational instability of infinitely extended homogeneous MHD plasma has been investigated. By taking in account these parameters we developed the six-order dispersion relation for magnetohydrodynamic (MHD) waves propagating in a homogeneous and isotropic plasma. The general dispersion relation has been developed from set of linearized basic equations and solved analytically to analyse the conditions of instability and instability of self-gravitating plasma embedded in a constant magnetic field. Our result shows that the presence of viscosity and thermal conductivity in a strong magnetic field substantially modifies the fundamental Jeans criterion of gravitational instability.


MHD gravitational instability magnetic fields stability viscosity 



I am thankful to the editor and anonymous referees for the evaluation of my paper.


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Institute of Geophysics Space Science and AstronomyAddis Ababa UniversityAddis AbabaEthiopia

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