Understanding CME deflections during the rising phase of solar cycle 24

SIEYRA, M. VALERIA; CÉCERE, MARIANA; CREMADES, H.; IGLESIAS, F. A; SAHADE, ABRIL; ET. AL.

Virtual

Simposio; VIII SBGEA; 2021

To better understand the governing conditions under CME deflections, weperformed a careful analysis of several events showing large deflections alonga one-year time interval. We used telescopes imaging the solar corona atdifferent heights and wavelengths on board the Project for Onboard Autonomy 2 (PROBA2), Solar Dynamics Observatory (SDO), Solar TErrestrialRElations 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 trajectoryof CMEs and the associated filament with respect to their solar sources bymeans of a forward model and a tie-pointing tool, respectively. The trajectory of both filament and CME is investigated and analyzed in the context ofthe coronal magnetic field, obtained at different heights from PFSS extrapolation. We determine the angle between the trajectory and the gradient ofthe magnetic energy density. In agreement with previous reports, we foundthat 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 andfor lower heights this behavior is not clearly defined.