Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...745..144a&link_type=abstract
The Astrophysical Journal, Volume 745, Issue 2, article id. 144 (2012).
Astronomy and Astrophysics
Astronomy
2
Acceleration Of Particles, Sun: Flares, Sun: Particle Emission, Sun: X-Rays, Gamma Rays
Scientific paper
The Geostationary Operational Environmental Satellite (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 Gamma-ray Burst Monitor and Large Area Telescope experiments. The remarkably similar hard X-ray and high-energy γ-ray time profiles suggest that most of the particles were accelerated to energies gsim300 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 10 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 γ-rays.
Ackermann Marcelo
Ajello Marco
Allafort Alice
Atwood William B.
Baldini Luca
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