Acceleration in fast halo CMEs and synchronized flare HXR bursts
Temmer M.1, Veronig A.2, Vrsnak B.1, Rybák J.3,
Gömöry P.3, Stoiser S.2, Maricic D.1
1 Hvar Observatory, Faculty of Geodesy, University of Zagreb,
Kaciceva 26, HR-10000 Zagreb, Croatia
2 IGAM/Kanzelhoehe Observatory, Institute of Physics, Universiteat Graz,
Universiteatsplatz 5, A-8010 Graz, Austria
3 Astronomical Institute of the Slovak Academy of Sciences,
SK-05960 Tatranská Lomnica, Slovakia
Abstract:
We study two well-observed, fast halo CMEs, covering
the full CME kinematics including the initiation and impulsive acceleration phase, and their associated
flares. We find a close synchronization between the CME acceleration profile and the flare energy release
as indicated by the RHESSI hard X-ray flux onsets, as well as peaks occur simultaneously within 5 minutes.
These findings indicate a close physical connection between both phenomena and are interpreted in terms of
a feedback relationship between the CME dynamics and the reconnection process in the current sheet beneath
the CME.