High-energy gamma-ray signature of proton acceleration during 1991 June 15 solar flare

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Scientific paper

We consider the γ-ray and radio observations for the 06.15.1991 flare. It is shown that these data give the first possibility for precise determination of proton spectrum in 10 MeV-10 GeV energy range in flare site. The power law γ-ray spectrum up to 1 GeV indicates that the maximum energy in power law primary proton spectrum is >=10 GeV. The time profiles of cm-radioemission and of γ-ray in 0.8-10 MeV energy band and above 50 MeV coincide. A continuous and simultaneous acceleration of protons and relativistic electrons at the gradual phase of the flare gives a natural explanation of the data.

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