ANALYSIS OF A LONG-DURATION AR THROUGHOUT FIVE SOLAR ROTATIONS: MAGNETIC PROPERTIES AND EJECTIVE EVENTS

IGLESIAS, F.A.; CREMADES, H.; MERENDA, L.; MANDRINI, C.H.; LÓPEZ, FERNANDO M.; LÓPEZ FUENTES, M.C,; UGARTE-URRA, I.

Reunión virtual

Congreso; Committee on Space Research General Assembly; 2021

COSPAR

Coronal mass ejections (CMEs), which are among the most magnificent solar eruptions, area major driver of space weather and can thus affect diverse human technologies. Differentprocesses have been proposed to explain the initiation and release of CMEs from solar activeregions (ARs), without reaching consensus on which is the predominant scenario, and thusrendering impossible to accurately predict when a CME is going to erupt from a given AR. Toinvestigate AR magnetic properties that favor CMEs production, we employ multi-spacecraftdata to analyze a long duration AR (NOAA 11089, 11100, 11106, 11112 and 11121) throughoutits complete lifetime, spanning five Carrington rotations from July to November 2010. Weuse data from the Solar Dynamics Observatory to study the evolution of the AR magneticproperties during the five near-side passages, and a proxy to follow the magnetic flux changeswhen no magnetograms are available, i.e. during far-side transits. The ejectivity is studiedby characterizing the angular widths, speeds and masses of 108 CMEs that we associated tothe AR, when examining a 124-day period. Such an ejectivity tracking was possible thanks tothe multi-viewpoint images provided by the Solar-Terrestrial Relations Observatory and Solarand Heliospheric Observatory in a quasi-quadrature configuration. We also inspected the X-rayflares registered by the GOES satellite and found 162 to be associated to the AR under study.Given the substantial number of ejections studied, we use a statistical approach instead of asingle-event analysis. We found three well defined periods of very high CMEs activity and twoperiods with no mass ejections that are preceded or accompanied by characteristic changes inthe AR magnetic flux, free magnetic energy and/or presence of electric currents. Our largesample of CMEs and long term study of a single AR, provide further evidence relating ARmagnetic activity to CME and Flare production.