Spectrums of solar protons and a particles as determined from emulsions are given for the May 10, July 14, and July 16, 1959, flares, and the July 13, and July 18, 1961, flares. These spectrums are expressed as exponentials in rigidity. The fluxes have been measured at several different times during each flare. The proton to α-particle ratio can be determined at six different times during these five flares.
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P. S. Freier (1963) studied this question.
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