Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.113..341c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 113, no. 2, July 1985, p. 341-347.
Astronomy and Astrophysics
Astrophysics
3
Gravitation, Jeans Theory, Larmor Radius, Magnetohydrodynamic Stability, Porosity, Inviscid Flow, Perturbation Theory, Stellar Atmospheres, Stellar Evolution, Wave Propagation
Scientific paper
The magnetogravitational instability of an infinite, homogeneous, and infinitely conducting plasma flowing through a porous medium is studied. The finite ion Larmor radius (FLR) effects and viscosity are also incorporated in the analysis. The prevalent magnetic field is assumed to be uniform and acting in the vertical direction. A general dispersion relation has been obtained from the relevant linearized perturbation equations of the problem. The wave propagation parallel and perpendicular to the direction of the magnetic field have been discussed. It is found that the condition of the instability is determined by the Jeans (1902) criterion for a self-gravitating, infinitely conducting, magnetized fluid through a porous medium. Furthermore, for transverse perturbation, FLR is found to have stabilizing influence when the medium is considered inviscid.
Chhajlani R. K.
Sanghvi Raj Kamal
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