The highest flux of solar neutrinos come directly from the proton-proton interaction, and have a low energy, up to 400 keV. There are also several other significant production mechanisms, with energies up to 18 MeV. From the Earth, the amount of neutrino flux at Earth is around 7·10 10 particles·cm −2 ·s −1. The number of neutrinos can be predicted with great confidence by the Standard ... More @Wikipedia
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