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Flux Rope Formation Preceding Coronal Mass Ejection Onset View all abstracts by submitter

Bernhard Kliem   Submitted: 2009-06-28 18:29

We analyse the evolution of a sigmoidal (S shaped) active region toward eruption, which includes a coronal mass ejection (CME) but leaves part of the filament in place. The X-ray sigmoid is found to trace out three different magnetic topologies in succession: a highly sheared arcade of coronal loops in its long-lived phase, a bald-patch separatrix surface (BPSS) in the hours before the CME, and the first flare loops in its major transient intensity enhancement. The coronal evolution is driven by photospheric changes which involve the convergence and cancellation of flux elements under the sigmoid and filament. The data yield unambiguous evidence for the existence of a BPSS, and hence a flux rope, in the corona prior to the onset of the CME.

Authors: L. M. Green and B. Kliem
Projects: Yohkoh-SXT,SoHO-MDI

Publication Status: ApJ Letters, in press
Last Modified: 2009-06-29 09:40
Go to main E-Print page  Endpoint Brightenings in Erupting Filaments  Signatures of Alfv?en waves in the polar coronal holes as seen by EIS/Hinode  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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