Understanding CME deflections during the rising phase of solar cycle 24

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

Simposio; VIII Brazilian Symposium in Space Geophysics and Aeronomy (SBGEA); 2021

To better understand the governing conditions under CME deflections, we performed a careful analysis of several events showing large deflections along a one-year time interval. We used telescopes imaging the solar corona at different heights and wavelengths on board the Project for Onboard Autonomy 2 (PROBA2), Solar Dynamics Observatory (SDO), Solar TErrestrial RElations Observatory (STEREO) and Solar and Heliospheric Observatory (SOHO) spacecraft. Taking advantage of the quadrature position of spacecraft from October 2010 until September 2011 we inspected the 3D trajectory of CMEs and the associated filament with respect to their solar sources by means of a forward model and a tie-pointing tool, respectively. The trajectory of both filament and CME is investigated and analyzed in the context of the coronal magnetic field, obtained at different heights from PFSS extrapolation. We determine the angle between the trajectory and the gradient of the magnetic energy density. In agreement with previous reports, we found that for most of the events the trajectory is against the direction of the magnetic energy density gradient for altitudes greater than 2.5 solar radii and for lower heights this behavior is not clearly defined.