Unusual time history of hard X-ray and gamma-ray emissions from the 1981 April 4 flare

Astronomy and Astrophysics – Astronomy

Scientific paper

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Emission Spectra, Gamma Ray Astronomy, Solar Flares, Solar Limb, Solar X-Rays, Temporal Distribution, Nuclear Reactions, Particle Acceleration, Spaceborne Astronomy, Spectrum Analysis

Scientific paper

The Hinotori satellite observed an unusual time history of hard X-ray and gamma-ray emissions from a limb flare on Apr. 4, 1981. The detailed comparison of the time history reveals that the gamma-ray emission precedes the hard X-ray emission by about 10 s. The following three possibilities are suggested to explain the unusual time history: (1) the ion acceleration precedes the electron acceleration; (2) the ions and electrons are simultaneously accelerated, but the nuclear reactions responsible for gamma-ray emission precede the electron bremsstrahlung responsible for hard x-ray emission; and (3) the gamma-rays and hard X-rays are simultaneously emitted, but the hard X-rays are strongly attenuated from the limb effect.

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