The first evidence of the gamma-ray emission from the quiescent Sun was found in the archival EGRET data that was later confirmed by Fermi-LAT observations with high significance.
This emission is produced by Galactic cosmic rays (CRs) penetrating the inner heliosphere and interacting with the solar atmosphere and optical photons. The solar emission is characterized by two spatially and spectrally distinct components: (i) disk emission due to the CR cascades in the solar atmosphere, and (ii) spatially extended inverse Compton (IC) emission due to the CR electrons scattering off of solar photons. The intensity of both components associated with Galactic CRs anti-correlate with the level of the solar activity being the brightest during solar minimum.
In this paper we discuss updates of the models of the IC component of the emission based on CR measurements made at different levels of solar activity, and we make predictions for e-ASTROGAM and AMEGO, proposed low-energy gamma-ray missions.
Volume 301 -
35th International Cosmic Ray Conference (ICRC2017) -
Session Gamma-Ray Astronomy. GA-galactic
Solar gamma rays and modulation of cosmic rays in the inner heliosphere
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Pre-published on:
August 16, 2017
Published on:
August 03, 2018
Abstract
DOI: https://doi.org/10.22323/1.301.0693
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.