Analysis of a flare and accompanying eruption in NOAA AR 12127: Magnetic field topology and comparison with observations

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

San Juan

Workshop; Towards Future Research on Space Weather Drivers; 2019

During August 2014 an M1.5 flare took place in AR 12127 followed by a lamenteruption, observed by several instruments including the H-alpha Solar Telescope for Argentina,HASTA, and a coronal mass ejection (CME). We report on a preliminary study of the coronalmagnetic eld topology obtained by a linear force-free eld (LFFF) extrapolation of thephotospheric eld measured by the Heliospheric and Magnetic Imager. The determination ofquasi-separatrix layers suggests a breakout and a quadrupolar reconnection as the main triggeringmechanisms of the observed are and eruption. LFFF extrapolations, however, have knownlimitations in the estimation of some important magnetic eld parameters associated to eruptiveevents, e.g. free magnetic energy and magnetic helicity. These and other disadvantages can beovercome by employing more sophisticated, non-linear force free eld extrapolations (NLFFFE)that require, however, a more complex pre-processing of the input vector magnetograms usedas boundary condition. We also report on the preliminary results of a NLFFF extrapolation ofAR 12127 that can better model key pre-eruptive, coronal eld topological features.