Gravitational Ballooning Instability of Prominences
Abstract
Prominences can be unstable to a gravitational ballooning instability of the RayleighTaylor type. A twodimensional generalized KippenhahnSchlüter prominence equilibrium is constructed. Its stability to ideal, threedimensional, shortwavelength linetied 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.
 Publication:

Solar Physics
 Pub Date:
 January 1994
 DOI:
 10.1007/BF00645178
 Bibcode:
 1994SoPh..149...63S
 Keywords:

 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;
 Solar Physics