Energy spectra of solar flare gamma-ray emission in the range 0.03-2 GeV registered by gamma-1 telescope

Details Energy spectra of solar flare gamma-ray emission in the range 0.03-2 GeV registered by gamma-1 telescope Energy spectra of solar flare gamma-ray emission in the range 0.03-2 GeV registered by gamma-1 telescope

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..249l&link_type=abstract

Advances in Space Research, Volume 13, Issue 9, p. 249-253.

Physics

1

Scientific paper

The gamma-ray telescope GAMMA-1 has registered gamma-emission in the range 30 - 2000 MeV from two solar flares. Spectral analysis with the use of maximum likelihood and maximum entropy methods has revealed the difference of gamma-ray production mechanism. In contrast with impulsive March 26, 1991 event where high energy gamma-rays originate exclusively as a bremstrahlung of primary accelerated electrons, at the extended phase of June 15, 1991 flare mainly the decay of neutral pions is responsible for the observed gamma-emission. An average spectral index for primary nucleons was -3.6. Evolution of the spectra for both flares shows tendency to a decrease of the primary particles mean energies with time.

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