Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..118...95v&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 118, no. 1-2, 1988, p. 95-121.
Astronomy and Astrophysics
Astronomy
34
Continuous Radiation, Energetic Particles, Solar Flares, Frequency Distribution, Gamma Ray Astronomy, Particle Acceleration, Solar Maximum Mission, X Ray Astronomy
Scientific paper
The properties of solar flare continuum emission at energies >300 keV are discussed. Emphasis is placed on observations made during the 21st Solar Maximum by γ-ray detectors aboard the Solar Maximum Mission and Hinotori satellites. The statistical properties of high-energy flares are presented, including their size-frequency distribution, spectral-index distribution, position distribution, and associated soft X-ray size. The temporal structure of the high-energy continuum is reviewed as well as attempts to model the structure by two-step acceleration and particle trapping. Evidence for the directivity of flare radiation is presented and statistical and stereoscopic analysis techniques are compared and contrasted. The first observations of flare γ-rays at energies >10 MeV are examined. It is shown that the very high-energy emission must be a mixture of pion-decay radiation and primary electron bremsstrahlung. High-energy observations from the extended phase of the giant 3 June, 1982 flare is presented.
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