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Solar proton fluences for 1977-1983 space missions (1974)

King, J. H.

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Publication Date: 2011-08-16

Description: The probability with which any given solar proton fluence level will be exceeded during a space mission is computed for mission to be flown during the active phase of the next solar cycle (1977-1983). This probability is a function of fluence level, proton energy threshold, and mission duration. Calculations are based on 1966-1972 data only. In estimating mission fluences, a distinction is made between ordinary and anomalously large events. Probable numbers of each type of event are estimated from Burrell's extension of Poisson statistics. Fluences of all anomalously large events are assumed to have a spectrum given by the August 1972 event, while fluences of the ordinary events are assumed to obey a log normal distribution.

Keywords: SPACE RADIATION

Type: Journal of Spacecraft and Rockets; 11; June 197

Format: text

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