HR: 08:40h
AN: SH21A-03    [PDF]
TI: A 3D Line-Tied Model of Flux Rope Eruptions
AU: * Isenberg, P A
EM: phil.isenberg@unh.edu
AF: Institute for the Study of Earth, Oceans and Space and Department of Physics, University of New Hampshire, Morse Hall, 39 College Road UNH, Durham, NH 03824 United States
AU: Forbes, T G
EM: terry.forbes@unh.edu
AF: Institute for the Study of Earth, Oceans and Space and Department of Physics, University of New Hampshire, Morse Hall, 39 College Road UNH, Durham, NH 03824 United States
AB: We consider the 3D force-free flux rope configuration which was proposed by Titov and Demoulin [Astron. Astrophys., 351, 707, 1999] as an approximation to the observed topology of coronal structures leading to eruptive flares. This configuration consists of a toroidal flux rope, oriented vertically, which intersects the photospheric surface at some distance above the center of the torus, along with several other photospheric sources which make up the potential background field in the corona. We extend the analysis of this configuration to correctly implement the effects of photospheric line-tying. We then investigate the equilibrium properties of this configuration and the conditions which yield an ideal loss of equilibrium. We follow the subsequent eruption of the flux rope under the assumption that the coronal portion retains a circular arc structure. Ultimately, this model will provide a semi-analytic 3D description of the evolution of coronal magnetic structures during an eruptive flare.
DE: 7509 Corona
DE: 7513 Coronal mass ejections
DE: 7531 Prominence eruptions
DE: 7827 Kinetic and MHD theory
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting