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

Congreso; Towards Future Research on Space Weather Drivers; 2019

During August 2014 an M1.5 flare took place in AR 12127 followed by a filament eruption, 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 coronal magnetic field topology obtained by a linear force-free field (LFFF) extrapolation of the photospheric field measured by the Heliospheric and Magnetic Imager. The determination of quasi-separatrix layers suggests a breakout and a quadrupolar reconnection as the main triggering mechanisms of the observed flare and eruption. LFFF extrapolations, however, have known limitations in the estimation of some important magnetic field parameters associated to eruptive events, e.g. free magnetic energy and magnetic helicity. These and other disadvantages can be overcome by employing more sophisticated, non-linear force free field extrapolations (NLFFFE) that require, however, a more complex pre-processing of the input vector magnetograms used as boundary condition. We also report on the preliminary results of a NLFFF extrapolation of AR 12127 that can better model key pre-eruptive, coronal field topological features.