Fermi Detection of γ-ray emission from the M2 Soft X-ray Flare on 2010 June 12

Abstract

The GOES M2-class solar flare, SOL2010-06-12T00:57, was modest in many respects yet exhibited remarkable acceleration of energetic particles. The flare produced an ~50 s impulsive burst of hard X- and γ-ray emission up to at least 400 MeV observed by the Fermi GBM and LAT experiments. The remarkably similar hard X-ray and high-energy γ-ray time profiles suggest that most of the particles were accelerated to energies >300 MeV with a delay of ~10 s from mildly relativistic electrons, but some reached these energies in as little as ~3 s. The γ-ray line fluence from this flare was about ten times higher than that typically observed from this modest GOES class of X-ray flare. There is no evidence for time-extended >100 MeV emission as has been found for other flares with high-energy γrays.

arXiv comment27 pages, 7 figures. Corresponding Authors: M. S. Briggs, [email protected]; D. Gruber, [email protected]; F. Longo, [email protected]; N. Omodei, [email protected]; G. H. Share, [email protected]

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