Fermi GBM Collaboration, Fermi LAT Collaboration, B. R. Dennis, R. A. Schwartz, A. K. Tolbert
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 \gamma-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 \gamma-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 \gamma-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 \gamma rays.
View original:
http://arxiv.org/abs/1111.7026
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