Other
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..987p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 987-993. Previously announced in STAR as N85-19913.
Other
63
Bremsstrahlung, Directivity, Gamma Rays, Pitch (Inclination), Relativistic Electron Beams, Solar Flares, Angular Distribution, Histograms, Isotropism, Photosphere, Solar Limb, Solar Maximum Mission
Scientific paper
It has been observed that flares with greater than 10 MeV gamma-ray emission are concentrated around the solar limb with a dispersion of 10 to 20 degrees. It is shown that the bremsstrahlung by relativistic electrons is responsible for such gamma-rays and that the expected relativistic beaming cannot explain this dispersion. It is argued that this dispersion is predominately a reflection of the pitch angle distribution of the electrons. Then it is shown that this requires a small variation of the magnetic field from the point where the electrons are injected to the photosphere and a nearly isotropic (in the downward direction) pitch angle distribution at the injection. The influence of other effects on the observed distribution is also discussed.
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