IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Flares and coronal mass ejections in an active-region complex
Autor/es:
MANDRINI, C.H.; SCHMIEDER, B.; DÉMOULIN, P.; GUO, Y.; CRISTIANI, G.D.
Lugar:
Praga
Reunión:
Congreso; Solar and Stellar Flares: Observations, Simulations, and Synergies; 2014
Resumen:
We study the violent events that occurred in the complex
of two active regions (ARs), NOAA numbers 11121 and 11123, observed in November
2010 with instruments onboard the Solar Dynamics Observatory and from Earth.
Within one day the total magnetic flux increased by 70 per cent with the
emergence of new groups of bipoles in AR 11123. These emergences led to a very
complex magnetic configuration in which around ten solar flares, some of them
accompanied by coronal mass ejections (CMEs), occurred. A magnetic-field
topology computation indicates the presence of null points, associated
separatrices, and quasi-separatrix layers (QSLs), where magnetic reconnection
is prone to occur. Based on this analysis, we propose a scenario to explain the
origin of a low-energy event preceding a filament eruption, which is
accompanied by a two-ribbon flare and CME, and a consecutive confined flare in
AR 11123. The results of our topology computation can also explain the
locations of flare ribbons in two other events, one preceding and one following
the ones just mentioned.