Compton Scattering of the Hard X-Ray Flux of Solar Flares with Various Angular Anisotropies of Hard X-Ray Sources

Abstract

The contribution of photons reflected from the solar photosphere to the intensity and the change in the slope of the energy spectrum of solar flare hard X-rays were analyzed as a function of the X-ray anisotropy. The angular and energy distributions of primary hard X-rays and the position of the flare loop on the solar disk were the main parameters in calculations. The contribution of the reflected component to the total flux for an anisotropic source may be as high as 70% at an energy range of 30–40 keV if the source is shifted relative to the solar disk center. The maximum change in the X-ray spectral index is 0.5.