Comparisons of high latitude E > 20 MeV proton geomagnetic cutoff observations with predictions of the SEPTR model

Details Comparisons of high latitude E > 20 MeV proton geomagnetic cutoff observations with predictions of the SEPTR model Comparisons of high latitude E > 20 MeV proton geomagnetic cutoff observations with predictions of the SEPTR model

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002angeo..20..997k&link_type=abstract

Annales Geophysicae, vol. 20, Issue 7, pp.997-1005

Physics

4

Scientific paper

Radiation effects from solar energetic proton (SEP) events are a concern when the International Space Station reaches high latitudes accessible to SEPs. We use data from the 20 29 and 29 64 MeV proton channels of the Proton/Electron Telescope on the SAMPEX satellite during nine large SEP events to determine the experimental geographic cutoff latitudes for the two energy ranges. These are compared with calculated cutoff latitudes based on a computer model, SEPTR (solar energetic particle tracer). The observed cutoff latitudes are systematically equatorward of the latitudes calculated by the SEPTR program using a Tsyganenko field model, but that model produces mean values of ~ 2° for latitudinal differences with observations, D

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