Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..349k&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 349-353.
Astronomy and Astrophysics
Astrophysics
90
Gamma Ray Observatory, Gamma Ray Spectra, Gamma Ray Telescopes, Solar Flares, Bremsstrahlung, Emission Spectra, Light Curve, Protons, Solar Spectra, Solar X-Rays
Scientific paper
The detection of high energy photon emission from a long-duration solar gamma-ray flare on June 11, 1991 is reported. Gamma rays were detected up to energies above 1 GeV. The solar origin of this emission is assured by the time profile of the gamma-ray count rate and by time-resolved sky maps, which show a clear maximum at the position of the sun. There are indications for a spectral evolution with time, such that the emission below 100 MeV fades away earlier than the 100-300 MeV radiation, roughly on the time scale of the fast component. The spectrum of the flare can be well fitted with a composite of a proton generated pi exp 0 spectrum and an electron bremsstrahlung component. The latter can be identified with the fast decaying component of the lightcurve.
Bertsch David L.
Fichtel Carl E.
Hartman Robert C.
Hunter Stan D.
Kanbach Gottfried
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