PoS - Proceedings of Science
Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - CRI - Cosmic Ray Indirect
Estimation of solar disk gamma-ray emission based on Geant4
Z. Li*, S. Chen, Y. Nan, H. He and C. Li
Full text: pdf
Pre-published on: July 22, 2019
Published on: July 02, 2021
The most important astrophysical mechanism for steady solar gamma-ray emission is the interaction of cosmic rays with solar atmosphere, which has been definitely detected by Fermi-LAT with maximum energy up to 200 GeV. Some studies shown that the effect of the solar magnetic field to solar disk gamma-ray flux is unneglectable. It is valuable to study the physical mechanism between solar disk gamma-ray flux and solar magnetic field. In this paper, we simulated the interaction between cosmic rays and solar atmosphere by G4SOLAR program based on Geant4. A simulated solar disk gamma-ray flux from 1GeV to 1TeV was obtained with taking into account the influence of coronal magnetic field. The PFSS model for “quiet”Sun was employed, and the solar disk gamma-ray below 10GeV was consistent with the Fermi observation. But the simulated spectrum became much softer than Fermi data when >10GeV. Some influence factors were briefly discussed.
DOI: https://doi.org/10.22323/1.358.1182
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