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Fermi Detection of Gamma-Ray Emission from the M2 Soft X-Ray Flare on 2010 June 12The 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 approximately 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 greater than or equal to 300 MeV with a delay of approximately 10 s from mildly relativistic electrons, but some reached these energies in as little as approximately 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 greater than 100 MeV emission as has been found for other flares with high-energy gamma rays.
Document ID
20120008396
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Ackermann, M. (Deutsches Elektronen-Synchrotron Zeuthen, Germany)
Ajello, M. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Allafort, A. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Atwood, W. B. (California Univ. Santa Cruz, CA, United States)
Baldini, L. (Istituto Nazionale di Fisica Nucleare Pisa, Italy)
Barbiellini, G. (Istituto Nazionale di Fisica Nucleare Trieste, Italy)
Bastieri, D. (Istituto Nazionale di Fisica Nucleare Padova, Italy)
Bechtol, K. (California Univ. Santa Cruz, CA, United States)
Bellazzini, R. (Istituto Nazionale di Fisica Nucleare Pisa, Italy)
Bhat, P. N. (Alabama Univ. Huntsville, AL, United States)
Blandford, R. D. (California Univ. Santa Cruz, CA, United States)
Bonamente, E. (Istituto Nazionale di Fisica Nucleare Perugia, Italy)
Borgland, A. W. (California Univ. Santa Cruz, CA, United States)
Bregeon, J. (Istituto Nazionale di Fisica Nucleare Pisa, Italy)
Briggs, M. S. (Alabama Univ. Huntsville, AL, United States)
Brigida, M. (Istituto Nazionale di Fisica Nucleare Bari, Italy)
Bruel, P. (Centre National de la Recherche Scientifique Palaiseau, France)
Buehler, R. (California Univ. Santa Cruz, CA, United States)
Burgess, J. M. (Alabama Univ. Huntsville, AL, United States)
Buson, S. (Istituto Nazionale di Fisica Nucleare Padova, Italy)
Caliandro, G. A. (Istituto de Ciencies de l'Espai Barcelona, Spain)
Cameron, R. A. (Alabama Univ. Huntsville, AL, United States)
Gruber, D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Troja, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Casandjian, J. M. (Univsrsite Paris Diderot Gif sur Yvette, France)
Date Acquired
August 25, 2013
Publication Date
January 1, 2012
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.5878.2012
GSFC.JA.7277.2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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