Comparisons of Low Energy (E > 20 MEV) Proton Geomagnetic Cutoffs observed on Sampex with Predictions Based on the Septr Model

Details Comparisons of Low Energy (E > 20 MEV) Proton Geomagnetic Cutoffs observed on Sampex with Predictions Based on the Septr Model Comparisons of Low Energy (E > 20 MEV) Proton Geomagnetic Cutoffs observed on Sampex with Predictions Based on the Septr Model

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4060k&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

A computer model, SEPTR (solar energetic particle tracer), has been developed at Rice University to calculate upper rigidity cutoffs of energetic particles entering the magnetosphere. This model may serve as a tool for making space environmental predictions during solar energetic particle (SEP) events and therefore must be tested using SEP data from polar orbiting spacecraft. We use data from the 20 29 and 29 64 MeV proton channels of the Proton/Electron Telescope on the SAMPEX satellite for a number of polar cap passes during large SEP events to determine the experimental geographic cutoff latitudes for the two energy ranges. These are compared with the calculated cutoff latitudes based on the SEPTR program. With the International Geomagnetic Reference Field (IGRF) of 1995 as the geomagnetic field model in SEPTR, the predicted cutoff latitudes are systematically too far poleward by about 5° to 10° . The differences are considerably reduced with the use of the Tsyganenko magnetospheric field model, but a systematic poleward error remains. We find no trend in the latitudinal cutoff differences with increasing Kp in SEP events accompanied by geomagnetic storms.

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