A Geomagnetic Cutoff Rigidity Interpolation Tool: A Discussion of its Application to Space Weather

Statistics – Applications

Scientific paper

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1532 Reference Fields (Regional, Global), 2104 Cosmic Rays, 2479 Solar Radiation And Cosmic Ray Effects, 7514 Energetic Particles (2114), 7599 General Or Miscellaneous

Scientific paper

We have developed a fast and accurate geomagnetic vertical cutoff interpolation tool that has general space weather applications. The interpolation aid is based on cutoff rigidity values determined from world grids of geomagnetic cutoff rigidities obtained by tracing cosmic ray trajectories through the Tsyganenko magnetospheric field model combined with the International Geomagnetic Reference Field. Calculations were done for a 450 km satellite altitude for all magnetic conditions represented by Kp indices ranging from super quiet to extremely disturbed. The interpolation tool extrapolates these results to other positions or altitudes. We demonstrate the accuracy of this vertical geomagnetic cutoff interpolation tool by comparing our predicted cutoff latitudes with those measured by the SAMPEX spacecraft. In general our predicted cutoff latitudes are within about one degree of the observed cutoff latitudes for low levels of geomagnetic activity and within several degrees at high levels of geomagnetic activity.

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