Recent experimental determinations of the total proton γ-ray production cross sections are used together with equatorial proton fluxes measured on ATS 1 to calculate the predicted diurnal variations in the precipitating low-energy solar proton-produced γ rays. Reasonable agreement is obtained in the relative diurnal variations for observations separated 2 hours in local time and on approximately the same L shell. However, the predicted γ-ray fluxes, using the equatorial data, are approximately 10 times less than those actually measured.
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L. J. Lanzerotti (1971) studied this question.
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