Estimating Solar Proton Flux at LEO From a Geomagnetic Cutoff Model
Technical Report,07 Oct 2013,14 Jul 2015
Air Force Research Laboratory, Space Vehicles Directorate Kirtland AFB United States
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This report describes a method for predicting proton flux in low earth orbit LEO during a solar proton event SPE. In particular, integral fluxes of 5 and 30 MeV protons are required, though it can be applied equally to other energy ranges. The method depends on a geomagnetic cutoff model, proton measurements from a geosynchronous GEO GOES satellite, and the geomagnetic Kp index. Its limitations and statistical accuracy are also described. The recommended cutoff model is empirical. Its results are also compared to the theoretical model of Smart and Shea.