On the high-energy neutrons and gamma rays in solar flares

Details On the high-energy neutrons and gamma rays in solar flares On the high-energy neutrons and gamma rays in solar flares

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..771k&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Oct. 1984, p. 771-774) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Sept.-Oc

Astronomy and Astrophysics

Astronomy

2

Energetic Particles, Gamma Ray Astronomy, Neutrons, Solar Flares, Solar Neutrons, Nuclear Reactions, Photons, Solar Limb

Scientific paper

Solar flare data from events of June 21, 1980 and June 3, 1982 are cited as evidence that the escape of energetic neutron and gamma ray photons is more probable from the limb than the center of the solar disk. Neutrons with 50-600 MeV energies are found mainly in p-alpha and alpha-p reactions up to certain energy levels, after which the p-p reaction dominates. The lower matter density in the upper solar atmosphere reduces the incidence of the p-p reactions. Also, the scattering which allows neutrons to escape is more severe in a line-of-sight disk flare than a limb flare, so neutrons are more readily observed from a limb flare. Similar arguments for gamma ray scattering lead to predicted fluxes which correspond well with data from the two recorded flares.

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