Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jpsj...54..487y&link_type=abstract
Physical Society of Japan, Journal (ISSN 0031-9015), vol. 54, Feb. 1985, p. 487-489.
Physics
14
Fluence, Gamma Ray Spectra, Nuclear Reactions, Solar Flares, Solar Physics, Compton Effect, Limb Darkening, Particle Acceleration, Photosphere, Solar Atmosphere
Scientific paper
The Hinotori satellite observed eight solar gamma-ray line flares between April, 1981 and June, 1982. Ratios of the fluence of 2.22 MeV gamma-ray line resulting from neutron capture on proton to the fluence of 4.44 MeV gamma-ray line resulting from the nuclear deexcitation of C are shown as a function of the heliolongitude of flare. The ratios are roughly constant for disk flares, but decreased for limb flares. The present result suggests that the particle acceleration produces energy spectra that do not vary much from flare to flare. The limb darkening of the ratios can be interpreted in terms of the attenuation of the 2.22 MeV gamma-ray line by Compton scattering in the photosphere.
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