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Energetic solar proton versus terrestrially trapped proton fluxes for the active years 1977 - 1983Ratios of solar to trapped proton fluences were computed for circular-orbit, geocentric space missions to be flown during the active phase of the next solar cycle (1977-1983). The ratios are presented as functions of orbit altitude and inclination, mission duration, proton energy threshold, and the chance the mission planner is willing to take that the actually encountered solar proton fluence will exceed the design fluence provided by the statistical solar proton model. It is shown that the ratio is most sensitively dependent on orbit altitude and inclination, with trapped protons dominant for low inclination, low and mid altitude orbits and for high inclination, mid altitude orbits. Conversely, solar protons are dominant for high inclination, low altitude orbits, and for low and high inclination, high altitude orbits.
Document ID
19740022146
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
King, J. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Stassinopoulos, E. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1974
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-X-70716
X-601-74-221
Accession Number
74N30259
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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