Analysis of large deflections of prominence-CME events during the rising phase of solar cycle 24

SIEYRA, V., CÉCERE, M., CREMADES, H., IGLESIAS, F., SAHADE, A., MIERLA, M., STENBORG, G., COSTA, A., WEST,M.,HUYS,E.

SOLAR PHYSICS

SPRINGER

Lugar: Berlin; Año: 2020 vol. 295

0038-0938

EDITOR'S CHOICEThe analysis of the deflection of coronal mass ejection (CME)events plays an important role in the improvement of the forecastingof their geo-effectiveness. Motivated by the scarcity of comprehen-sive studies of CME events with focus on the governing conditionsthat drive deflections during their early stages, we performed an ex-tensive analysis of 13 CME events that exhibited large deflectionsduring their early development in the low corona. The study was ca-rried out by exploiting solar corona imaging observations at differentheights and wavelengths from instruments onboard several space andground solar observatories, namely the Project for Onboard Auto-nomy 2 (PROBA2), Solar Dynamics Observatory (SDO), Solar TE-rrestrial RElations Observatory (STEREO), Solar and Heliospheric Observatory (SOHO) spacecraft, and from National Solar Observa-tory (NSO). The selected events were observed between October 2010and September 2011, to take advantage of the location in near quadra-ture of the STEREO S/C and Earth in this time period. In particular,we determined the 3D trajectory of the front envelope of the CMEsand their associated prominences with respect to their solar sourcesby means of a forward modeling and tie-pointing tool, respectively. Byusing a potential field source surface model, we estimated the coronalmagnetic fields of the ambient medium through which the eventspropagate to investigate the role of the magnetic energy distributionin the non-radial propagation of both structures (front envelope andprominence) and in their kinematic properties. The ambient magneticenvironment during the eruption and early stages of the events isfound to be crucial in determining the trajectory of the CME events,in agreement with previous reports.