HR: 1340h
AN: SH13A-1155    [Abstracts]
TI: Can the Roll Effect in Prominence Eruption Be Explained by Anisotropic Electrical Conductivity?
AU: * Choe, G S
EM: gchoe@pppl.gov
AF: Princeton Plasma Physics Laboratory, P. O. Box 451, Princeton, NJ 08543 United States
AU: Cheng, C Z
EM: fcheng@pppl.gov
AF: Princeton Plasma Physics Laboratory, P. O. Box 451, Princeton, NJ 08543 United States
AB: When a prominence erupts, it generally rises non-radially and the top part of the prominence ribbon bends in one direction to make the ribbon horizontally flat. This phenomenon is very recently discovered and named the ``role effect'' by S. F. Martin. This effect can hardly be understood in the framework of ideal MHD or MHD with isotropic conductivity. Such breaking of a geometrical symmetry in the evolution of an initially symmetric system can take place when the electrical conductivity is anisotropic. We perform simulations of a solar magnetic field evolution with anisotropic conductivity. Now the magnetic field does not only move together with plasma bulk flows, but also with electric currents. Thus the rising motion of the field is skewed to one direction. When magnetic reconnection takes place in a magnetic loop or arcade, the reconnected field under the reconnection region is swept by the reconnecting current and is consequently bent over as observed in prominence eruptions.
DE: 7509 Corona
DE: 7519 Flares
DE: 7524 Magnetic fields
DE: 7531 Prominence eruptions
DE: 7843 Numerical simulation studies
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting