Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235.1047l&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 1047-1054.
Astronomy and Astrophysics
Astrophysics
3
Satellite Observation, Solar Flares, Solar Spectra, Solar Terrestrial Interactions, Solar X-Rays, X Ray Spectroscopy, Atmospheric Models, Earth Atmosphere, Emission Spectra, Monte Carlo Method, Oso-5, Radiant Flux Density, Radiative Transfer, Reflected Waves, Solar Activity Effects, Spectrum Analysis
Scientific paper
We have studied the spectra of three solar flares with second-stage hard X-ray emission observed by instruments on board the OSO 5 spacecraft. Using a Monte Carlo program, we have calculated the expected flux of solar X-rays reflected from the Earth's atmosphere for the observed solar X-ray spectra. The results have been compared with the observed reflected fluxes, which were also detected by the above instruments. We show that for the events considered here, which are necessarily intense and have hard spectra, the simple extrapolation of the observed solar spectrum to higher energies cannot explain the observed flux of the reflected radiation. Instead, we find the need to postulate the existence of a solar X-ray flux at energies above 200 keV larger than that obtained from simple extrapolation. In particular, we find evidence against a thermal spectrum in at least one of the events considered.
Frost Kenneth J.
Langer Steven H.
Petrosian Vahe
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