The Evolution of the Magnetic Field Structure for the May 12, 1997 CME Event*

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We analyze the evolving magnetic field structure for the May 12,1997 CME event by using a three-step numerical approach. First, thecoronal magnetic field prior to the CME eruption on May 12,1997 is extrapolated in the potential approximation. Second,this configuration is then sheared and twistedquasi-statically to build up a force-free configurationwith a free magnetic energy sufficient for eruption. At thethird step, this configuration is driven to eruption bycanceling the twisted magnetic flux at the polarityinversion line. We demonstrate that the configurationcontains from the beginning a so-called hyperbolic fluxtube which is a union of two intersecting quasi-separatrixlayers. At later stages, other structural featuresdevelop in the evolving configuration. They are analyzedand related to the characteristics of the observed eruption.*Research supported by NASA and the Center for IntegratedSpace Weather Modeling (an NSF Science and TechnologyCenter).

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