The Impact of the Magnetic Field Structure on May 12, 1997 CME Event*

Details The Impact of the Magnetic Field Structure on May 12, 1997 CME Event* The Impact of the Magnetic Field Structure on May 12, 1997 CME Event*

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh13a0284t&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH13A-0284

Other

7513 Coronal Mass Ejections (2101), 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835)

Scientific paper

We analyze the evolving magnetic field structure in May 12, 1997 CME event by using a numerical model constructed in the following three steps. First, an analytical model of the coronal magnetic field prior to the CME eruption on May 12, 1997 is developed in the current-free approximation. It is constructed by superimposing a large-scale background field and a localized bipole field to model the active region. The parameters of the model are optimized to fit the potential field obtained from an MDI magnetogram. Second, this configuration is then sheared and twisted in a quasi-static manner to build up a force-free configuration with a free magnetic energy sufficient for eruption. At the third step, this configuration is driven to eruption by canceling the twisted magnetic flux at the polarity inversion line. We demonstrate that the configuration contains from the beginning the so-called hyperbolic flux tube which is a union of two intersecting quasi-separatrix layers. At later stages, other structural features are developing in the evolving configuration. They are analyzed and related to the characteristics of the observed eruption. *Research supported by NASA and the Center for Integrated Space Weather Modeling (an NSF Science and Technology Center).

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