Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42a0482s&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH42A-0482
Physics
2720 Energetic Particles, Trapped, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2788 Storms And Substorms
Scientific paper
The cutoff rigidity of relativistic particles (cosmic rays, solar energetic particles, etc.) that enter the magnetosphere and atmosphere have traditionally been determined with numerical particle orbit integration calculated backwards in time utilizing a suitable magnetic field model. Such models were usually of empirical nature, such as the IGRF and Tsyganenko models. At mid-latitudes and near the polar cap boundary, however, such magnetic field models may not be very accurate during geomagnetic storm times. In this study we therefore employ a magnetospheric magnetic field from a global MHD simulation of the Earth's magnetosphere. We compare our results with those from simpler models, like IGRF and Tsyganenko 1996, for quiet times as well as for magnetically disturbed times.
Raeder Joachim
Springborn J.-
Weygand James M.
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