Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1102s&link_type=abstract
American Astronomical Society, SPD meeting #42, #11.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The GOES M2-class solar flare, SOL2010-06-12T00:57, was modest in many respects yet exhibited remarkable acceleration of energetic particles. While both radio and SDO/AIA UV/EUV images indicate a compact flare with foot-point separation of just 10 arc sec, this small region produced an 70 sec burst of hard X-and gamma-ray emission up to at least 200 MeV observed by the Fermi GBM and LAT experiments. The gamma-ray line and >300 keV bremsstrahlung fluences from this flare were about ten times higher than that typically observed from this modest GOES-class of X-ray flare. Analysis of the combined nuclear line and high-energy gamma-ray emissions suggests that the accelerated proton spectrum at the Sun softened significantly above 50 MeV. We compare these observations with measurements of solar energetic protons to determine whether the particle populations at the Sun and in space may have a common origin. The 34 and 80 GHz microwave emissions are very bright and well correlated with the few hundred keV X-ray emission, but with small time lags suggesting mild trapping of electrons in the corona.
Briggs Michael Stephen
Fermi GBM Collaboration
Fermi LAT Collaboration
Gruber Duane
Longo Francesco
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