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Companion event and precursor of the X17 flare on 28 October 2003

Show simple item record Mandrini, C. H. Demoulin, P. Schmieder, B. Deluca, E. E. Pariat, E. Uddin, W. 2009-07-03T07:17:14Z 2009-07-03T07:17:14Z 2006-11-09
dc.description.abstract A major two-ribbon X17 flare occurred on 28 October 2003, starting at 11:01 UT in active region NOAA 10486. This flare was accompanied by the eruption of a filament and by one of the fastest halo coronal mass ejections registered during the October – November 2003 strong activity period. We focus on the analysis of magnetic field (SOHO/MDI), chromospheric (NainiTal observatory and TRACE), and coronal (TRACE) data obtained before and during the 28 October event. By combining our data analysis with a model of the coronal magnetic field, we concentrate on the study of two events starting before the main flare. One of these events, evident in TRACE images around one hour prior to the main flare, involves a localized magnetic reconnection process associated with the presence of a coronal magnetic null point. This event extends as long as the major flare and we conclude that it is independent from it. A second event, visible in Hα and TRACE images, simultaneous with the previous one, involves a large-scale quadrupolar reconnection process that contributes to decrease the magnetic field tension in the overlaying field configuration; this allows the filament to erupt in a way similar to that proposed by the breakout model, but with magnetic reconnection occurring at Quasi-Separatrix Layers (QSLs) rather than at a magnetic null point. en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries sp238-293
dc.subject Quasi-Separatrix Layers, Chromosphere en_US
dc.title Companion event and precursor of the X17 flare on 28 October 2003 en_US
dc.type Article en_US

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