Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0417m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0417
Other
2101 Coronal Mass Ejections (7513), 7513 Coronal Mass Ejections (2101), 7524 Magnetic Fields, 7531 Prominence Eruptions
Scientific paper
It has long been know that coronal mass ejections (CMEs) originate from magnetic polarity inversion lines (PILs) where the magnetic field is nearly horizontal and parallel to the PIL. Observations are showing in increasing detail that vigorous shearing motions in active regions proceed CMEs and produce the build up of energy that drives the eruption. It has recently been shown that such shearing motions are driven by the Lorentz force that naturally arises when bipolar magnetic fields emerge through the photosphere. Numerical simulations have shown one case where shearing motions caused an emerging flux rope to erupt. While several simulations of emerging flux ropes have been performed, no other example has produced an eruption. Here, we present the results of a parameter study to determine the circumstances in which emerging flux ropes will erupt as a model for CME initiation. These magnetohydrodynamic simulations demonstrate how shear flows driven by the Lorentz force depend on the degree of twist, the field strength and the size of the flux rope. Shearing motions transport axial flux and energy from the submerged portion of the field to the expanding coronal portion. This process explains the sheared geometry of prominence magnetic fields and also why these magnetic structures erupt in flares and CMEs.
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