High-energy gamma rays and neutrinos (> GeV) from the Sun

The Sun is an intense and steady source of gamma rays, likely due to hadronic interactions between Galactic cosmic rays and the solar atmosphere.The gamma-ray flux measured by Fermi, however, is much larger than previous theoretical estimates. I will discuss recent observational results that revealeven more surprising features, including time variability that anticorrelates with the solar activity, a hard spectrum, and a strange spectrum dip, etc.  In the near future, very high-energy observation by HAWC/LHAASO and neutrino observation by IceCube may help understand the underlying physics.  Cosmic-ray interaction with the Sun can be a new probe of cosmic rays in the solar system and solar atmosphere;  a better understanding is important for neutrino and dark matter searches from the Sun. 

Kenny Ng (Weizmann Inst, Israel)
DoA, Rm 2907
Mon, 2018-06-04 12:00 to 13:00