MHD instabilities of atmospheres with magnetic fields

Details MHD instabilities of atmospheres with magnetic fields MHD instabilities of atmospheres with magnetic fields

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..731z&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 731-745.

Astronomy and Astrophysics

Astrophysics

31

Gravitational Effects, Magnetohydrodynamic Stability, Stellar Atmospheres, Stellar Magnetic Fields, Taylor Instability, Density Distribution, Equilibrium Equations, Isobars (Pressure), Perturbation Theory, Stellar Gravitation

Scientific paper

The MHD energy principle is used to derive a stability criterion for two-dimensional equilibrium systems consisting of magnetized plasma in a gravitational field. The interplay between magnetic and gravitational forces in determining stability is studied, and the criterion is applied to a family of two-dimensional magnetostatic atmospheres described by Zweibel and Hundhausen (1980). All members of the family except the potential field are found to be locally unstable to horizontal displacements, and the instabilities are explained in terms of pinching, interchange, and Rayleigh-Taylor effects.

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