Physics
Scientific paper
May 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972ssrv...13....3c&link_type=abstract
Space Science Reviews, Volume 13, Issue 1, pp.3-123
Physics
8
Scientific paper
The purpose of this work is to study the various γ-ray-production mechanisms in solar flares and to calculate the flux, the spectrum, and the decay curves of γ radiation. Using the continuity equation and taking into account the energy losses for solar-flare-accelerated particles, we obtain the time-dependent particle distribution and thus the time behavior of the resulting γ rays. The important processes for producing γ rays in solar flares are found to be nonthermal electron bremsstrahlung, decay of neutral π mesons, positron annihilation, neutron capture, and decay of excited nuclei. The results are applied to several known solar flares. For a large flare such as the class 3+ on February 23, 1956, continuous γ rays with energies up to 100 MeV from electron bremsstrahlung and neutral π meson decays are observable at the orbit of the Earth by existing γ-ray detectors. Line γ rays from positron annihilation (0.51 MeV), neutron capture (2.23 MeV), and deexcitation of excited nuclei O16 (6.14 and 7.12 MeV) and C12 (4.43 MeV) are particularly strong and well above the continuous γ-ray background due to electron bremsstrahlung. These lines can be detected at the Earth.
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