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Recently Begemann 1959 has confirmed the results of Craig 1957 and Begemann and Libby 1957 that the natural production rate of tritons is greater than might be expected from production by the cosmic-ray flux in the atmosphere. Two mechanisms have been considered to explain this discrepancy: (a) accretion of solar-produced tritons by the earth, as suggested by B. Feld and J. Arnold; and (b) additional production by the low-energy component of the cosmic radiation at times of minimum solar activity. The integrated flux of primary cosmic-ray particles varies with solar activity, and by a factor of 2 to 4 during a solar-activity cycle. The purpose of this note is to point out a third source, namely, intense fluxes of eneretic solar protons which could produce tritons and C14 in the terrestrial atmosphere at times near the maximum of the solar-activity cycle.
J. A. Simpson (Sun,) studied this question.