CAOSP abstracts, Volume: 36, No.: 2, year: 2006

Abstract: Solar γ emission with energy 0.05 - 300 MeV was observed by SONG instrument onboard the CORONAS-F satellite during a solar flare of 20 January 2005. Measured spectra show the peculiar excess in the 26 - 200 MeV energy range produced by neutral pion decay. The presence of pions proofs that protons were accelerated up to energies > 200 MeV during this flare. Comparison of temporal profiles of high-energy gamma emission with GLE onset time observed by neutron monitors network leads to conclusion that these protons escaped from the Sun immediately after their acceleration. The strong anisotropy of proton enhancements is discussed and a pitch angle distribution of high-energy proton fluxes in interplanetary space is estimated.

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Last update: May 30, 2006