Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..150..267k&link_type=abstract
Solar Physics, vol. 150, no. 1-2, p. 267-283
Astronomy and Astrophysics
Astronomy
28
Particle Acceleration, Particle Emission, Radio Astronomy, Relativistic Particles, Solar Corpuscular Radiation, Solar Cosmic Rays, Solar Electrons, Solar Flares, Solar Protons, Spectrum Analysis, Visible Spectrum, Bessel Functions, Bremsstrahlung, Coronagraphs, Gamma Ray Observatory, Gamma Ray Spectra, H Alpha Line, Mathematical Models, Nuclear Reactions, Pions, Solar Neutrons, Solar Radio Emission, Solar X-Rays
Scientific paper
Data on X-, gamma-ray, optical and radio emission from the 1991 June 15 solar flare are considered. We have calculated the spectrum of protons that produces gamma-rays during the gradual phase of the flare. The primary proton spectrum can be described as a Bessel-function-type up to 0.8 GeV and a power law with the spectral index approximately equal to 3 from 0.8 up to 10 GeV or above. We have also analyzed data on energetic particles near the Earth. Their spectrum differed from that of primary protons producing gamma-ray line emission. In the gradual phase of the flare additional pulses of energy release occurred and the time profiles of cm-radio emission and gamma-rays in the 0.8-10 MeV energy band and above 50 MeV coincided. A continuous and simultaneous stochastic acceleration of the protons and relativistic electrons at the gradual phase of the flare is considered as a natural explanation of the data.
Armstrong Thomas P.
Chuikin E. I.
Kocharov Grant E.
Kocharov Leon G.
Kovaltsov Gennadi A.
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