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Gamma rays from pion decay - Evidence for long-term trapping of particles in solar flaresThe energy spectrum and time dependence of the 50 MeV to 2 GeV gamma rays observed from the 1991 June 11 solar flare are analyzed. It is shown that the emission detected at the late phase of this flare with EGRET on the Compton Gamma-Ray Observatory can be explained by a model in which the bulk of the particles were accelerated during the impulsive phase and subsequently trapped in coronal magnetic loops. The observed spectrum was fit with a combination of pion decay radiation and primary electron bremsstrahlung. The 1991 June 11 data are compared with data for the 1982 June 3 and 1991 June 15 flares from which pion decay emission was also observed. The fact that the fluxes from these three flares are ordered in time in accordance with the predicted time dependence of emission produced by trapped particles provides support for the model.
Document ID
19920071772
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mandzhavidze, Natalie
(Maryland, University College Park, United States)
Ramaty, Reuven
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
September 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 396
Issue: 2, Se
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
92A54396
Distribution Limits
Public
Copyright
Other

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