Evolution of global magnetic parameters in an active region with recurring ejective events

M. LÓPEZ FUENTES; M. POISSON; C. H. MANDRINI

Cordoba

Congreso; 63° Reunión Anual de la Asociación Argentina de Astronomía; 2021

Observatorio Astronómico de Córdoba

Between May 8 and 10, 2012, a series of confined plasma ejections produced by minifilament eruptions and accompanied by M-class flares, were observed in active region (AR) NOAA 11476. These events, which have been analyzed in previous works, were associated with the presence of a small rotating bipole that emerged in the middle of the globally bipolar AR magnetic configuration. The bipole rotation continued along the days during which the ejections were observed. The presence of magnetic flux cancellation was also identified along the polarity inversion line of the bipole, where the minifilaments were recurringly formed and ejected. In this work, we analyzethe evolution of global magnetic parameters of the AR, such as the mean force-free parameter and the total current helicity, to correlate them temporally and spatially with the observed events. For that, we use magnetograms obtained with the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO), X-ray lightcurves obtained with the Geostationary Operational Environmental Satellite (GOES) and data from the Space-Weather HMI Active Region Patches (SHARP) database. From the relation between the evolution of the analized parameters and the observed eruptions we conclude that they can be used as possible predictors of solar ejective events.