Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh13a1155c&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH13A-1155
Physics
7509 Corona, 7519 Flares, 7524 Magnetic Fields, 7531 Prominence Eruptions, 7843 Numerical Simulation Studies
Scientific paper
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.
Cheng C. Z.
Choe Gwang-Son
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