Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh41a1611m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH41A-1611
Physics
7509 Corona, 7513 Coronal Mass Ejections (2101), 7519 Flares, 7524 Magnetic Fields, 7531 Prominence Eruptions
Scientific paper
It has long been know that magnetic field near polarity inversion lines (PILs) 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. Here, we examine the degree to which these shear flows couple the convection zone to the corona with a series of larger-scale MHD simulations of emerging magnetic flux ropes. Shearing motions transport flux, energy and magnetic helicity from the submerged portion of the field to the expanding coronal portion, causing a build up which may cause coronal mass ejections.
Fang Fan
Manchester Ward
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