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The GOES M2-class solar flare, SOL2010-06-12T00:57, was modest in manyrespects yet exhibited remarkable acceleration of energetic particles. Theflare produced an ~50 s impulsive burst of hard X- and \gamma-ray emission upto at least 400 MeV observed by the Fermi GBM and LAT experiments. Theremarkably similar hard X-ray and high-energy \gamma-ray time profiles suggestthat most of the particles were accelerated to energies >300 MeV with a delayof ~10 s from mildly relativistic electrons, but some reached these energies inas little as ~3 s. The \gamma-ray line fluence from this flare was about tentimes higher than that typically observed from this modest GOES class of X-rayflare. There is no evidence for time-extended >100 MeV emission as has beenfound for other flares with high-energy \gamma rays.

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