Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42a0483k&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH42A-0483
Physics
2118 Energetic Particles, Solar, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
We investigate numerically the relationship between time variations in the geomagnetic cutoff and prompt trapping of Solar Energetic Particles inside the pre-storm cutoff, which form new radiation belt populations distinct from the CRAND-produced inner zone. This is done for several CME-shock initiated geomagnetic storms including the 14 July 2000, 24 Nov 2001, and 21-23 April 2002 storms. Following Smart and Shea [2000], Solar Energetic Particle (SEP) access is determined by computing the reverse particle trajectories. Magnetospheric fields are obtained from the Lyon-Feder-Mobarry (LFM) global MHD model, which is driven by measured solar wind parameters at the sunward boundary. We find well-defined surfaces of constant cutoff that exhibit dynamic behavior in response to solar wind conditions. The results suggest that an enhanced solar wind dynamic pressure plays a direct role in the observed ion injections. Additional mechanisms for SEP access and trapping are considered, including the the role of ULF waves.
Hudson Mary K.
Kress Brian T.
Perry K. L.
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