Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2920b&link_type=abstract
American Astronomical Society Meeting 210, #29.20; Bulletin of the American Astronomical Society, Vol. 39, p.140
Astronomy and Astrophysics
Astronomy
Scientific paper
One mechanism that has been proposed for initiating Coronal Mass Ejections is the ``breakout'' model. In this model, reconnection at a magnetic null point in the solar corona reduces overlying field, allowing the eruption of low-lying field. For this model to account for Coronal Mass Ejections, a coronal null point must be present prior to the eruption. We investigate the relationship between the existence of coronal null points and eruptive events using a large collection of vector magnetograms from the Imaging Vector Magnetograph at Haleakala. Each magnetogram is subjected to Magnetic Charge Topology analysis, including determining the presence of coronal null points. It is found that the majority of events originate in regions above which no null point is found. However, a statistical test shows that it is extremely unlikely that the occurrence of coronal null points and eruptive events are independent.
This material is based upon work supported by the National Science Foundation under Grant No. 0454610, and by the Air Force Office of Scientific Research under contract 49620-03-C-0019.
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