ProtonSolar activity levels with at least one high energy event (Class X Flares).Proton EventIn solar-terrestrial terms, the measurement of at least 10 protons/cm2/sec/steradian at energies greater than 10 MeV.Proton FlareIn solar-terrestrial terms, any flare producing significant fluxes of greater-than-10 MeV protons in the vicinity of the earth.
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