Simulated Coronal Mass Ejections Originating in Complex Source Regions

Details Simulated Coronal Mass Ejections Originating in Complex Source Regions Simulated Coronal Mass Ejections Originating in Complex Source Regions

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp24a..03d&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP24A-03

Physics

7513 Coronal Mass Ejections (2101), 7519 Flares, 7526 Magnetic Reconnection (2723, 7835)

Scientific paper

Previously, we have investigated numerically the initiation of coronal mass ejections (CMEs) in the simplest possible solar sources: a single bipolar active region embedded in the Sun's global background field. If the overall topology is more complex than bipolar, with a magnetic null and separatrices dividing the coronal field into two or more flux systems, then the configuration is susceptible to magnetic-breakout eruptions. Breakout reconnection across the null allows the overlying field to be pushed aside, after which the highly stressed field below undergoes a fast, free, ideal expansion into the outer corona and heliosphere. We are now beginning to address more complex scenarios in which two bipolar active regions, side by side, spawn breakout CMEs. A CME originating at the polarity inversion line (PIL) separating the two active regions breaks open the central arcade of the combined configuration, and is analogous to an eruption occurring at the interior PIL of a single active region embedded in a background field. We also are investigating single CMEs originating at the interior PIL of either active region in the new scenario, i.e., in either side arcade of the configuration. Furthermore, stressing both interior PILs of the active regions contemporaneously gives rise to the possibility of paired sympathetic eruptions, either simultaneous or delayed, originating in the two distant side arcades. We will report our progress on simulating and understanding these more complex scenarios for CME initiation. NASA and ONR support our research.

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