The role of the preexisting magnetic environment with newly emerging flux in flares

SCHMIEDER, B.; MANDRINI, C.H.; DÉMOULIN, P.; GUO, Y.

Niza

Workshop; Flux Emergence Workshop 2013; 2013

Observatoire de Paris

AR 11123 formed along 24 hours by successive emergence of bipoles. This AR formed within the trailing polarity of the long-lived AR 11121, between 10 and 11 November 2010. The growth of this AR was observed by SDO/HMI and THEMIS vector magnetographs.  SDO/AIA (304 A and 171 A) allows us  to follow the development of five flares during one day time, which involved the eruption of two active region filaments. A topology analysis shows the existence of 3 null points. One is local, while two connect to the preceeding AR. Reconnection occurs above the filament favouring its eruption. Round-shape ribbons overlay the separatrices between the two regions.