Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm41a1108k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM41A-1108
Physics
2720 Energetic Particles, Trapped, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2788 Storms And Substorms
Scientific paper
We investigate numerically the relationship between geomagnetic cutoff and the prompt trapping of Solar Energetic Particles (SEPs) in the inner magnetosphere during storms, which form new radiation belt populations distinct from the cosmic ray albedo neutron decay (CRAND) source protons in the inner zone. SEP cutoffs are modeled using the Lyon-Feder-Mobarry (LFM) global magnetosphere MHD code, which is driven by measured solar wind parameters at the sunward boundary. In a follow up to our recent paper [Kress et al., 2004], we further study SEP trajectories in fields from the 24 NOV 2001 LFM storm simulation. By mapping surfaces of constant cutoff rigidity in the LFM fields, we show that SEPs with access to the innermost L shells enter through the magnetopause on the day side and predominately in the magnetic equatorial plane. It is found that a significantly compressed magnetopause has a profound effect on the asymmetry of the cutoff surface suggesting a mechanism for SEP trapping.
Hudson Mary K.
Kress Brian T.
Slocum P. L.
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