Magnetic topology of AR 11158 and morphology of its associated CMEs: Time evolution

IGLESIAS, F. ; CREMADES, H.; MANDRINI, C.H.

La Serena

Congreso; Second Binational Meeting AAA-SOCHIAS; 2018

The NOAA 11158 active region produced numerous flares between 13 and 16 ofFebruary 2011, some of them were accompanied by coronal ejections ofdough. In this period, the emergence of two bipolosmagnic in the middle was observedof two pre-existing polarities of opposite sign. The flares and eventseruptions occurred along different portions of the polarity reversal line(LIP) The zones where the active events originate are related to thedisplacements of the polarities in emergency, including their sustained rotation, andthe presence of intense field shear zones observed in the magnetogramsvectors of the Helioseismic and Magnetic Imager on board the Solar DynamicsObservatory. From a model of the coronal magnetic field we findthe persistent presence of a null field point throughout the days analyzed.The structure of the field in the null environment, as well as its location aboveof the LIP, it varied with the evolution of the photographic field. We propose that theThe reconnection mechanism of the field that would occur in the vicinity of the null, forced by the movements of the photographic field, could lead to the decrease of themagnetic tension above the flow tube located along the LIP givingplace to its repeated eruptions.