Evolution of rising helical prominences in a nonuniform atmosphere

Physics

Scientific paper

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Solar Atmosphere, Solar Magnetic Field, Solar Prominences, Asymptotic Properties, Coronagraphs, Magnetic Field Configurations, Magnetohydrodynamics, Vertical Motion

Scientific paper

If, as the April 14 and May 5, 1980 coronal transient coronograph observations of rising solar prominences indicate, the prominences exhibit helical structure, further study must take account of three considerations: (1) since the ends of the prominence remain rooted in the photosphere, a significant stretching out of the configuration will take place as it rises; (2) due to the falloff with height of the external quantities, the prominence will experience time-varying boundary conditions as it rises; and (3) a significant lateral expansion of the prominence is expected, as the external conditions weaken with height. A very complex prominence dynamical behavior will result from the interplay of these effects. This behavior is presently elucidated by means of a model in which a helical pinch rises in a low beta atmosphere under the influence of an ambient magnetic field whose strength declines with distance from the solar center.

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