Analysis of Large Deflections of Prominence–CME Events during the Rising Phase of Solar Cycle 24

SIEYRA, M. VALERIA; CÉCERE, MARIANA; CREMADES, HEBE; IGLESIAS, FRANCISCO A.; SAHADE, ABRIL; MIERLA, MARILENA; STENBORG, GUILLERMO; COSTA, ANDREA; WEST, MATTHEW J.; D'HUYS, ELKE

SOLAR PHYSICS

SPRINGER

Lugar: Berlin; Año: 2020 vol. 295

0038-0938

The analysis of the deflection of coronal mass ejection (CME) events plays animportant role in the improvement of the forecasting of their geo-effectiveness. Motivatedby the scarcity of comprehensive studies of CME events with a focus on the governingconditions that drive deflections during their early stages, we performed an extensive analysisof 13 CME events that exhibited large deflections during their early development inthe low corona. The study was carried out by exploiting solar-corona-imaging observationsat different heights and wavelengths from instruments onboard several space- and groundbasedsolar observatories, namely the Project for Onboard Autonomy 2 (PROBA2), SolarDynamics Observatory (SDO), Solar TErrestrial RElations Observatory (STEREO), Solarand Heliospheric Observatory (SOHO) spacecraft, and from the National Solar Observatory(NSO). The selected events were observed between October 2010 and September 2011,to take advantage of the location in near quadrature of the STEREO spacecraft and Earthin this time period. In particular, we determined the 3D trajectory of the front envelope ofthe CMEs and their associated prominences with respect to their solar sources by meansof a forward-modeling and tie-pointing tool, respectively. By using a potential-field source-surface model, we estimated the coronal magnetic fields of the ambient medium throughwhich the events propagate to investigate the role of the magnetic-energy distribution in thenon-radial propagation of both structures (front envelope and prominence) and in their kinematicproperties. The ambient magnetic environment during the eruption and early stagesof the events is found to be crucial in determining the trajectory of the CME events, inagreement with previous reports.