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Small-Scale Magnetic Fields are Critical to Shaping Solar Gamma-Ray Emission
Jung-Tsung Li, John F. Beacom, Spencer Griffith +1
The Sun is a bright gamma-ray source due to hadronic cosmic-ray interactions with solar gas. While it is known that incoming cosmic rays must generally first be reflected by solar…
The TeV Sun Rises: Discovery of Gamma rays from the Quiescent Sun with HAWC
A. Albert, R. Alfaro, C. Alvarez +89
We report the first detection of a TeV gamma-ray flux from the solar disk (6.3), based on 6.1 years of data from the High Altitude Water Cherenkov (HAWC) observatory. The 0.5--2…
First Observations of Solar Disk Gamma Rays over a Full Solar Cycle
Tim Linden, John F. Beacom, Annika H. G. Peter +3
The solar disk is among the brightest gamma-ray sources in the sky. It is also among the most mysterious. No existing model fully explains the luminosity, spectrum, time variabilit…
The Sun at GeV--TeV Energies: A New Laboratory for Astroparticle Physics
M. U. Nisa, J. F. Beacom, S. Y. BenZvi +5
The Sun is an excellent laboratory for astroparticle physics but remains poorly understood at GeV--TeV energies. Despite the immense relevance for both cosmic-ray propagation and d…
First HAWC Observations of the Sun Constrain Steady TeV Gamma-Ray Emission
A. Albert, R. Alfaro, C. Alvarez +92
Steady gamma-ray emission up to at least 200 GeV has been detected from the solar disk in the Fermi-LAT data, with the brightest, hardest emission occurring during solar minimum. T…
Unexpected Dip in the Solar Gamma-Ray Spectrum
Qing-Wen Tang, Kenny C. Y. Ng, Tim Linden +3
The solar disk is a bright source of multi-GeV gamma rays, due to the interactions of hadronic cosmic rays with the solar atmosphere. However, the underlying production mechanism i…