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

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

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

Between May 8 and 10, 2012, a series of confined plasma ejections produced by minifilament eruptionsand accompanied by M-class flares, were observed in active region (AR) NOAA 11476. These events, which havebeen analyzed in previous works, were associated with the presence of a small rotating bipole that emerged in themiddle of the globally bipolar AR magnetic configuration. The bipole rotation continued along the days duringwhich the ejections were observed. The presence of magnetic flux cancellation was also identified along the polarityinversion 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 currenthelicity, to correlate them temporally and spatially with the observed events. For that, we use magnetogramsobtained 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 fromthe Space-Weather HMI Active Region Patches (SHARP) database. From the relation between the evolution ofthe analized parameters and the observed eruptions we conclude that they can be used as possible predictors ofsolar ejective events.