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Fermi Detection of γ-Ray Emission from the M2 Soft X-Ray Flare on 2010 June 12
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2012 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 745, no 2, 144- p.Article in journal (Refereed) Published
Abstract [en]

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 similar to 50 s impulsive burst of hard X-and gamma-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 gamma-ray time profiles suggest that most of the particles were accelerated to energies greater than or similar to 300 MeV with a delay of similar to 10 s from mildly relativistic electrons, but some reached these energies in as little as similar to 3 s. The gamma-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 gamma-rays.

Place, publisher, year, edition, pages
2012. Vol. 745, no 2, 144- p.
Keyword [en]
acceleration of particles, Sun: flares, Sun: particle emission, Sun: X-rays, gamma rays
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-86980DOI: 10.1088/0004-637X/745/2/144ISI: 000300326800042ScopusID: 2-s2.0-84859899149OAI: diva2:502890
QC 20120330. Correction in: Astrophysical Journal, vol. 748, issue. 2, article nr. 151, doi: 10.1088/0004-637X/748/2/151Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2012-05-09Bibliographically approved

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Nymark, Tanja
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