CME Initiation and Shock Formation in Complex Active Regions: Comparing the April 21 and August 24, 2002 CME Events

Details CME Initiation and Shock Formation in Complex Active Regions: Comparing the April 21 and August 24, 2002 CME Events CME Initiation and Shock Formation in Complex Active Regions: Comparing the April 21 and August 24, 2002 CME Events

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh41c..05l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH41C-05

Physics

7509 Corona, 7513 Coronal Mass Ejections (2101), 7526 Magnetic Reconnection (2723, 7835), 7851 Shock Waves (4455), 7959 Models

Scientific paper

Complex active regions (ARs) often exhibit complicated magnetic topology with multiple null points and quasi- separators, as well as flux emergence and shearing motions. Our newly developed model for the initiation of a Coronal Mass Ejection (CME) mimics one consequence of flux emergence by studying the effects of the shearing of the two footprints of a small-scale dipole in the vicinity of an AR. Reconnection with the overlaying and neighboring magnetic fields results in an eruption whose footprints change location in a jump-like manner. We employed the Space Weather Modeling Framework to apply this model of CME initiation to the April 21 and August 24, 2002 ejections (from ARs 9906 and 10069, respectively). Those CMEs had similar properties, but their associated Solar Energetic Particle (SEP) events greatly differed. The studied ARs also displayed the complex magnetic topology required in our model of CME initiation. We discuss the initial evolution of the coronal magnetic field via reconnection at the pre-existing null points and quasi-separator, as well as the influence of the global magnetic field on the shock geometry and its possible implication for SEP production. We also compare the simulated events with relevant observations.

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