A long-duration active region: Evolution and quadrature observations of ejective events

CREMADES, H.; MANDRINI, C.H.; LÓPEZ FUENTES, M.C.; MERENDA, L.; CABELLO, I.; LÓPEZ, FERNANDO M.; POISSON, M.

Simposio; IAU Symposium 327; 2016

Unknown aspects of the initiation, evolution, and associated phenomenaof coronal mass ejections (CMEs), together with their capability ofperturbing the fragile technological equilibrium on which nowadayssociety depends, turn them a compelling subject of study. While spaceweather forecasts are thus far not able to predict when and where in theSun will the next CME take place, various CME triggering mechanisms havebeen proposed, without reaching consensus on which is the predominantone. To improve our knowledge in these respects, we investigate along-duration active region throughout its life, from birth until decayalong five solar rotations, in connection with its production ofejective events. We benefit from the wealth of solar remote-sensing datawith improved temporal, spatial, and spectral resolution provided by theground-breaking space missions STEREO, SDO, and SOHO. During theinvestigated time interval, which covers the months July - November2010, the STEREO spacecraft were nearly 180 degrees apart, allowing forthe uninterrupted tracking of the active region and its ensuing CMEs.The ejective aspect is examined from multi-viewpoint coronagraphicimages, while the dynamics of the active region photospheric magneticfield are inspected by means of SDO/HMI data for specific subintervalsof interest. The ultimate goal of this work in progress is to identifycommon patterns in the ejective aspect that can be connected with theactive region characteristics.