An Improved Calculation of the Yield of High-Energy Neutrinos from the Sun*

The observation of high-energy gamma-rays from the Sun using Fermi-LAT data suggests hadronic activity in the solar atmosphere. High-energy gamma-rays can be produced by the collision of cosmic rays producing neutral pions that subsequently decay into high-energy gamma-rays. Associated production of high-energy neutrinos, from GeV to 100 TeV in energy, is also expected. This contribution has been recently estimated but has yet to be observed. The most stringent upper limits arise from searches by Super-Kamiokande and IceCube on high-energy neutrinos from the Sun. This contribution presents a new calculation of the solar neutrino flux from the interaction of energetic cosmic rays in the solar atmosphere. In our updated calculation, we considered the effect of magnetic fields around the Sun and performed a detailed Monte Carlo simulation of the interactions of cosmic rays in the solar atmosphere.