Maria Valeria Sieyra (Centre for Mathematical Plasma Astrophysics, KU Leuven) will give an online seminar, on April 15, 14:00.
Title: Analysis of Large Deflections of Prominence–CME Events during the Rising Phase of Solar Cycle 24
Abstract
The analysis of the deflection of coronal mass ejection (CME) events plays an important role in the improvement of the forecasting of their geo-effectiveness. To better understand the governing conditions of CME deflections we performed an exhaustive analysis of several events showing large deflections along a one-year time interval during the rising phase of solar cycle 24. We inspected the 3D trajectory of CMEs and the associated filaments with respect to their solar sources by means of a forward model and a tie-pointing tool, respectively. We applied these techniques to solar corona observations at different heights and wavelengths onboard PROBA2, SDO, STEREO and SOHO. Inspired by previous works we analyse the influence of the magnetic energy density in the deflection of both structures using PFSS extrapolations. We determine the angle between the trajectory and the gradient of the magnetic energy density for the CMEs and for the associated filaments. We also analysed the kinematic properties of both structures and their relation to the deflection. We found that most of the deflection occurs at altitudes lower than 2.5 solar radii. In agreement with previous reports, for most of the CMEs the trajectories are in the direction of the magnetic energy density decrease while for prominences the direction seems to be related to the strength of the magnetic field. Also, we found a relation between the CME and filament speeds to the amount of deflection.
The link to the online event will be shared on this page.
