Based on an analysis of anomalously large
electron enhancements, a worst case spectrum for GEO was described [46]. For geostationary orbit only, as a supplement to the
above FLUMIC
model, a worst-case geostationary environment can be treated by
the substitution of the following two equations:
cm-2 day-1
sr-1
MeV
The NASA handbook [19] presents a different worst case environment in graphical form. It appears to be slightly harsher than the above presumably because it is based upon a single spectrum from measurements taken on 11 May 1992 over only a few hours at a selected longitude.