Initiation of the Slow-Rise and Fast-Rise Phases of an Erupting Solar Filamentby Localized Emerging Magnetic Field via Microflaring

Details Initiation of the Slow-Rise and Fast-Rise Phases of an Erupting Solar Filamentby Localized Emerging Magnetic Field via Microflaring Initiation of the Slow-Rise and Fast-Rise Phases of an Erupting Solar Filamentby Localized Emerging Magnetic Field via Microflaring

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0823s&link_type=abstract

American Astronomical Society, SPD meeting #37, #8.23; Bulletin of the American Astronomical Society, Vol. 38, p.234

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Scientific paper

EUV data from EIT show that a filament of 2001 February 28 underwent aslow-rise phase lasting about 6 hrs, before rapidly erupting in a fast-risephase. Concurrent images in soft X-rays (SXRs) from Yohkoh/SXT show that aseries of three microflares, prominent in SXT images but weak in EIT 195 AngEUV images, occurred near one end of the filament. The first and lastmicroflares occurred respectively in conjunction with the start of theslow-rise phase and the start of the fast-rise phase, and the second microflarecorresponded to a kink in the filament trajectory. Beginning within 10 hoursof the start of the slow rise, new magnetic flux emerged at the location of themicroflaring. This localized new flux emergence and the resulting microflares,consistent with reconnection between the emerging field and the sheared sigmoidcore magnetic field holding the filament, apparently caused the slow rise ofthis field and the transition to explosive eruption. For the first time insuch detail, the observations show this direct action of localized emergingflux in the progressive destabilization of a sheared core field in the onset ofa coronal mass ejection (CME). Similar processes may have occurred in otherrecently-studied events.NASA supported this work through NASA SR&T and SEC GI grants.

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