Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2204m&link_type=abstract
American Astronomical Society, SPD meeting #40, #22.04; Bulletin of the American Astronomical Society, Vol. 41, p.858
Astronomy and Astrophysics
Astronomy
Scientific paper
It has long been know that magnetic field near the polarity inversion lines (PILs) is often observed to be 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 present simulation results of emerging flux ropes that erupt, which offer clues to CME initiation. These magnetohydrodynamic simulations demonstrate how shearing and twisting motions depend on the degree of twist, the field strength and the size of the flux rope. This process explains the sheared geometry of prominence magnetic fields and also how these magnetic structures become energized to erupt in flares and CMEs.
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