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Title:
Observations and Modeling of a Filament on the Sun
Authors:
van Ballegooijen, A. A.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 15, Cambridge, MA 02138; )
Publication:
The Astrophysical Journal, Volume 612, Issue 1, pp. 519-529. (ApJ Homepage)
Publication Date:
09/2004
Origin:
UCP
ApJ Keywords:
Magnetohydrodynamics: MHD, Sun: Corona, Sun: Filaments, Sun: Magnetic Fields
DOI:
10.1086/422512
Bibliographic Code:
2004ApJ...612..519V

Abstract

Hα observations of a filament were obtained at the Swedish Vacuum Solar Telescope in 1998 June. The U-shaped filament has a prominent barb that exhibits interesting fine structure and internal motions. A three-dimensional magnetic model of the filament is presented. The model is based on a National Solar Observatory (Kitt Peak) magnetogram and is constructed by inserting a twisted flux rope into a potential field representing the overlying coronal arcade; the flux rope has an axial flux of 3.4×1019 Mx and poloidal flux of 3.7×109 Mx cm-1. Magnetofrictional relaxation is used to drive the configuration to a nonlinear force-free field. The shape of the resulting flux rope is distorted by neighboring network elements. The dips in the helical field lines reproduce the observed filament barb, which is caused by a local distortion of the flux rope resulting from a weak-field extension (~4 G) of a neighboring network element. The pitch of the helical field lines is larger than expected on the basis of a model of flux rope formation. I suggest that this is due to magnetic diffusion within the flux rope. A simple model of magnetic diffusion in a cylindrical flux rope is presented.
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