Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2210s&link_type=abstract
American Astronomical Society, SPD meeting #40, #22.10; Bulletin of the American Astronomical Society, Vol. 41, p.859
Astronomy and Astrophysics
Astronomy
Scientific paper
On December 10-11, 2005 a slow CME occurred in between two coronal streamers in the Western hemisphere. SOHO/MDI magnetograms show a multipolar magnetic configuration at the photosphere consisting of a complex of active regions located at the CME source and two bi-poles at the base of the lateral coronal streamers. White light observations reveal that the expanding CME affects both of the lateral streamers and induces the release of plasma within or close to them. These transient phenomena are possibly due to magnetic reconnections induced by the CME expansion that occurs either inside the streamer current sheet or between the CME flanks and the streamer.
Our observations show that CMEs can be associated to not only a single reconnection process at a single location in the corona, but also to many reconnection processes occurring at different times and locations around the flux rope. Numerical simulations are used to demonstrate that the observed lateral reconnections can be reproduced. These simulations suggest that the shear to be applied to the erupting arcade decreases as the number of lateral induced reconnections increases. The observed secondary reconnections associated to CMEs facilitate the CME release by globally decreasing the magnetic tension of the corona. Future CME models should therefore take into account the lateral reconnection effect.
Bemporad Alessandro
Poedts Stefaan
Soenen Alexander
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