Neutron and Proton Dosages in the Upper Atmosphere from Solar Flare Radiation

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Abstract
The radiation dosage from secondary neutrons as well as from primary and secondary protons in the earth's atmosphere during solar particle events is calculated as a function of the solar proton flux, atmospheric depth, and geomagnetic-cutoff rigidity. The dosage in rems from secondary neutrons exceeds the dosage from protons below 30 g/cm2 of residual atmosphere. Neutron dosages in rads are less than the dosage from primary protons at all depths above 100 g/cm2. The maximum neutron dose to travelers in supersonic aircraft during solar particle events of the magnitude observed during the last solar cycle would be of the order of I rem.

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