Mathematics – Logic
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh42a02c&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH42A-02
Mathematics
Logic
7513 Coronal Mass Ejections, 7519 Flares, 7524 Magnetic Fields
Scientific paper
Key issues in coronal mass ejection are the dynamical evolution of flux rope formation and the rapid escape of flux ropes from the siege of overlying closed fields and gravity. We propose two new mechanisms of formation and escape of flux ropes. First, we propose a new mechanism of flux rope formation by reconnection between emerging fields and overlying fields of different field line direction. In general, the emerging magnetic field and the overlying field have no topological connectivity and a current sheet can be formed in the interface of two flux systems, where magnetic reconnection takes place. If the emerging field and the overlying field subtend an acute angle, there is a strong guide field in the reconnection current sheet. In this case, magnetic reconnection occurring at multiple spots can generate flux ropes. If the emerging field has more flux than the overlying field, the flux rope can freely escape after all the overlying flux is reconnected. The second mechanism is based on a field system where a flux rope is generated within a magnetic arcade confined by another overlying arcade of different field line direction. The rising flux rope will push the surrounding line-tied field towards the overlying arcade and drive a reconnection between these two arcade fields. After the reconnection between these two arcade fields is completed, the flux rope will be in direct contact with the overlying arcade field, and a fast reconnection can occur to cause a rapid rising motion of the flux rope. If the magnetic flux contained in the underlying arcade including the flux rope is more than the flux in the overlying arcade, a nonzero net flux contained in the flux rope can escape out of the siege of the closed overlying line-tied fields. This scenario is supported by our recent study of explosive coalescence of two flux ropes [Choe and Cheng, ApJ, 2000]. Our numerical simulation results will be presented to demonstrate both mechanisms.
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