Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2201l&link_type=abstract
American Astronomical Society, SPD meeting #40, #22.01; Bulletin of the American Astronomical Society, Vol. 41, p.858
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results investigating the initiation of coronal mass ejections (CMEs) by dynamical flux emergence. Previous statistical studies have shown that a large percentage of CME events are preceded by the appearance of new magnetic flux. Current CME models, such as the magnetic breakout model, rely on the emergence of magnetic fields from beneath the surface, but do not simulate this emergence, instead using a choice of time-dependent boundary conditions to represent this process. In the case of the magnetic breakout model this involves shearing along the neutral line of a bipolar active region which is embedded in the Sun's overlying dipole field. The shear field causes reconnection and the removal of confining field above the active region, thus initiating a CME. We will simulate the emergence of sub-surface magnetic structures, such as magnetic flux tubes, into the atmosphere of the Sun and investigate whether this emergence can provide sufficient magnetic shear to initiate a CME within the context of the magnetic breakout model.
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