HR: 1330h
AN: SH42A-0482    [PDF]
TI: Cosmic Ray Cutoff Predictions Using Magnetic Fields From Global Magnetosphere MHD Simulations
AU: Springborn, J
EM: purplewhoppie@yahoo.com
AF: Institute of Geophysics and Planetary Physics University of California, Los Angeles, 3845 Slichter Hall PO Box 1567, Los Angeles, CA 90095 United States
AU: * Weygand, J M
EM: jweygand@igpp.ucla.edu
AF: Institute of Geophysics and Planetary Physics University of California, Los Angeles, 3845 Slichter Hall PO Box 1567, Los Angeles, CA 90095 United States
AU: Raeder, J
EM: J.Raeder@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AB: 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.
UR: http://www.igpp.ucla.edu/jweygand
DE: 2720 Energetic particles, trapped
DE: 2740 Magnetospheric configuration and dynamics
DE: 2753 Numerical modeling
DE: 2788 Storms and substorms
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting