Flux Rope Formation Preceding Coronal Mass Ejection Onset - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: We analyse the evolution of a sigmoidal S shaped active region towarderuption, which includes a coronal mass ejection CME but leaves part of thefilament in place. The X-ray sigmoid is found to trace out three differentmagnetic topologies in succession: a highly sheared arcade of coronal loops inits long-lived phase, a bald-patch separatrix surface BPSS in the hoursbefore the CME, and the first flare loops in its major transient intensityenhancement. The coronal evolution is driven by photospheric changes whichinvolve the convergence and cancellation of flux elements under the sigmoid andfilament. The data yield unambiguous evidence for the existence of a BPSS, andhence a flux rope, in the corona prior to the onset of the CME.



Author: L. M. Green, B. Kliem

Source: https://arxiv.org/



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