Observations of solar flare photon energy spectra from 20 keV to 7 MeV

Astronomy and Astrophysics – Astronomy

Scientific paper

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Energy Spectra, Photons, Solar Flares, Bremsstrahlung, Electrons, Gamma Ray Spectrometers, Spaceborne Astronomy, X Ray Spectroscopy

Scientific paper

Solar flare photon energy spectra in the 20 keV to 7 MeV range are derived from the Apr. 1, Apr. 4, Apr. 27 and May 13, 1981 flares. The flares were observed with a hard X-ray and a gamma-ray spectrometer on board the Hinotori satellite. The results show that the spectral shape varies from flare to flare and the spectra harden in energies above about 400 keV. Effects of nuclear line emission on the continuum and of higher energy electron bremsstrahlung are considered to explain the spectral hardening.

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