Brief Description:
SOLPRO is the computer version of the interplanetary proton fluence model
developed by King (1974) and Stassinopoulos and King (1974). The model is based
on the most continuous set of satellite data available at the time covering the
period of enhanced solar activity during solar cycle 20 (1964-1972). Because of
its size, the August 1972 event produced a fluence more than a factor of 10
larger than any other event in cycle 20. For that reason, King (1974) treats
this event separately and calls it an anomalously large (AL) event. The FORTRAN
subroutine SOLPRO calculates the interplanetary solar proton fluences (at 1
A.U. [Astronomical Unit] = Earth-Sun distance) as a function of mission
duration (in months), energy threshold (in MeV), and confidence level (in
percent). For a given combination of input parameters, the code determines
whether an anomalously large (AL) event needs to be considered and, if so, how
many. For missions whose trajectories involve significant time away from a
heliocentric distance of 1 A.U., a helioradial dependence of event fluences
must be considered (King, 1974). Similarly, for missions whose trajectories
involve partial magnetospheric shielding, the fractional exposure factor has to
be determined (Stassinopoulos and King, 1974). The model strongly depends on
the fluence of the 1972 AL event. This has led to over-predictions for cycle
21. Cycle 21 did not show a major event.
Availability: (1) Retrievable from CCMC's anonymous FTP site in directory /solpro. <
References:
J. H. King, Solar Proton Fluences for 1977-1983 Space Missions, J. Spacecraft
Rockets 11, 401, 1974. (B18663)
E. G. Stassinopoulos and J. H. King, Empirical Solar Proton Model for Orbiting Spacecraft Applications, IEEE Trans. Aerospace Electronic Systems 10, 4, 1974. (B17234)
J. H. King and E. G. Stassinopoulos, Energetic Solar Protons vs. Terrestrially Trapped Proton Fluxes for the Active Years 1977-1983, J. Spacecraft Rockets 12, 122, 1975. (B20337)
E. G. Stassinopoulos, SOLPRO: A Computer Code to Calculate Probabilistic Energetic Solar Proton Fluences, NSSDC 75-11, Greenbelt, Maryland, 1975. (B23274)
Go to the Model Web Models home page