Magnetogravitational instability of a finitely-conducting medium with variable streaming motion

Details Magnetogravitational instability of a finitely-conducting medium with variable streaming motion Magnetogravitational instability of a finitely-conducting medium with variable streaming motion

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..89..285s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 89, no. 2, Jan. 1983, p. 285-291.

Physics

Geophysics

6

Gravitation Theory, Jeans Theory, Magnetohydrodynamic Stability, Geophysics, Perturbation, Propagation Modes, Stellar Atmospheres, Transverse Waves, Wave Propagation

Scientific paper

A discussion of gravitational instability of a finitely conducting medium with streams of variable velocity distribution is made in the presence of a uniform magnetic field. It is found that the variable streaming motion shows a destabilizing effect and affects the instability criterion only in the case of general wave propagation. For purely parallel propagation to the direction of the magnetic field and the streaming motion, the criterion is independent of the variation in the streaming motion and further the Jeans's criterion is found to remain unaffected in this case. For purely transverse propagation, the criterion is independent of any streaming motion and the Jeans's criterion remains unaffected. The criterion is further independent of the magnetic field and the finite conductivity except in the case of transverse propagation where the magnetic field exhibits a stabilizing influence in case of an infinitely conducting medium.

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