Fermi detection of γ-ray emission from the M2 soft x-ray flare on 2010 June 12

M. Ackermann, M. Ajello, A. Allafort, W. B. Atwood, L. Baldini, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, P. N. Bhat, R. D. Blandford, E. Bonamente, A. W. Borgland, J. Bregeon, M. S. Briggs, M. Brigida, P. Bruel, R. Buehler, J. M. Burgess, S. BusonG. A. Caliandro, R. A. Cameron, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, V. Connaughton, J. Conrad, S. Cutini, B. R. Dennis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, C. Favuzzi, S. J. Fegan, E. C. Ferrara, P. Fortin, Y. Fukazawa, P. Fusco, F. Gargano, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, L. Grillo, J. E. Grove, D. Gruber, S. Guiriec, D. Hadasch, M. Hayashida, E. Hays, D. Horan, G. Iafrate, G. Jóhannesson, A. S. Johnson, W. N. Johnson, T. Kamae, R. M. Kippen, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, M. N. Mazziotta, J. E. McEnery, C. Meegan, J. Mehault, P. F. Michelson, W. Mitthumsiri, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, R. Murphy, M. Naumann-Godo, E. Nuss, T. Nymark, M. Ohno, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, W. S. Paciesas, J. H. Panetta, D. Parent, M. Pesce-Rollins, V. Petrosian, M. Pierbattista, F. Piron, G. Pivato, H. Poon, T. A. Porter, R. Preece, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, S. Ritz, C. Sbarra, R. A. Schwartz, C. Sgrò, G. H. Share, E. J. Siskind, P. Spinelli, H. Takahashi, T. Tanaka, Y. Tanaka, J. B. Thayer, L. Tibaldo, M. Tinivella, A. K. Tolbert, G. Tosti, E. Troja, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A. Von Kienlin, A. P. Waite, C. Wilson-Hodge, D. L. Wood, K. S. Wood, Z. Yang

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

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 50s impulsive burst of hard X- and γ-ray emission up to at least 400MeV 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 ≳300MeV with a delay of 10s from mildly relativistic electrons, but some reached these energies in as little as ∼ 3s. 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 >100MeV emission as has been found for other flares with high-energy γ-rays.

Original languageEnglish
Article number144
JournalAstrophysical Journal
Volume745
Issue number2
DOIs
Publication statusPublished - 1 Feb 2012
Externally publishedYes

Keywords

  • acceleration of particles Sun: flares Sun: particle emission Sun: X-rays, gamma rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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