Gravitational ballooning instability of prominences

Details Gravitational ballooning instability of prominences Gravitational ballooning instability of prominences

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..149...63s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 149, no. 1, p. 63-72

Physics

10

Ballooning Modes, Gravitational Effects, Solar Magnetic Field, Solar Prominences, Stellar Models, Taylor Instability, Density Distribution, Magnetic Field Configurations, Magnetic Flux, Magnetohydrodynamics, Perturbation, Plasma Equilibrium, Stellar Magnetospheres

Scientific paper

Prominences can be unstable to a gravitational ballooning instability of the Rayleight-Taylor type. A two-dimensional generalized Kippenhahn-Schluter prominence equilibrium is constructed. Its stability to ideal, three-dimensional, short-wavelength line-tied perturbations is analyzed. The instability requires a critical vertical density gradient. For a given magnetic field strength, the instability is sensitive to the angle at which the magnetic field lines cross the prominence. An approximate, sufficient, threshold condition is consistent with typical prominence parameters.

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