Modeling the Equilibrium and Eruption of a Finite Filament

B. P. Filippov

Institute of Terrestrial Magnetism, Aeronomy, and Radio Wave Propagation,
Russian Academy of Sciences, Troitsk, Moscow oblast, 142092 Russia

Received November 16, 1995

Abstract—The shape of a curve representing the axis of a filament (prominence) of finite length in equilibrium
in an external magnetic field is studied. The filament ends are anchored at the photosphere surface. The direc-
tion of the current in the filament corresponds to models with reverse polarity. The stabilizing action of the mag-
netic field component aligned with the filament axis on the filament equilibrium is demonstrated. To simplify
the calculations, it is assumed that the external field is in the vertical plane in which the filament is located and
remains parallel to the filament during its evolution. It is possible for a small filament segment to erupt without
disrupting the equilibrium of the bulk of the filament.

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