Evidence of Enhanced Particle Acceleration During a Plasmoid-Looptop Collision Observed with RHESSI

Details Evidence of Enhanced Particle Acceleration During a Plasmoid-Looptop Collision Observed with RHESSI Evidence of Enhanced Particle Acceleration During a Plasmoid-Looptop Collision Observed with RHESSI

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640426m&link_type=abstract

American Astronomical Society, AAS Meeting #216, #404.26; Bulletin of the American Astronomical Society, Vol. 41, p.904

Astronomy and Astrophysics

Astronomy

Scientific paper

Rare observations are presented of a downward-propagating plasmoid (formed in the wake of an erupting CME) merging with an underlying looptop kernel during an occulted limb event observed with RHESSI. RHESSI lightcurves in the 9-18 keV energy range, as well as that of the 245 MHz channel of the Learmonth Solar Observatory, show enhanced nonthermal emission in the corona at the time of the merging suggesting that additional particle acceleration took place. This was attributed to a secondary episode of magnetic reconnection in the current sheet that formed between the two merging sources. Complimentary observations from the SECCHI suite of instruments onboard STEREO-Behind showed that this process was concurrent with the acceleration phase of the associated CME. From wavelet-enhanced EUVI images evidence of inflowing magnetic field lines prior to the CME eruption is also presented. This combination of observations supports a recent numerical simulation of plasmoid formation, propagation and subsequent particle acceleration due to the tearing mode instability during current sheet formation.

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