HR: 0800h
AN: SM41A-1119    [Abstracts]
TI: Energetic Ions in the Magnetosphere during a Magnetic Storm
AU: * Richard, R L
EM: rrichard@igpp.ucla.edu
AF: IGPP, UCLA, 405 Hilgard Ave., Los Angeles, CA 90095 United States
AU: El-Alaoui, M
AF: IGPP, UCLA, 405 Hilgard Ave., Los Angeles, CA 90095 United States
AU: Ashour-Abdalla, M
AF: IGPP, UCLA, 405 Hilgard Ave., Los Angeles, CA 90095 United States
AU: Walker, R J
AF: IGPP, UCLA, 405 Hilgard Ave., Los Angeles, CA 90095 United States
AB: The magnetic storm of November 24, 2001 was characterized by an increase in the energetic ion flux in the solar wind by more than an order of magnitude over a wide energy range, and accompanied by the arrival of interplanetary shocks. Large increases in ion flux were observed by geosynchronous spacecraft, which was followed later by a substantial drop in DST. The shocks were accompanied by large increases in the dynamic pressure. Both solar energetic particle (SEP) penetration and accelerated solar wind ions contributed to the energetic particle population in the magnetosphere. To study the entry and acceleration processes we performed particle tracing calculations in the electric and magnetic fields from a global magnetohydrodynamic (MHD) simulation. We performed an MHD simulation of this storm interval by using solar wind and IMF time series measured by upstream spacecraft which determine the upstream boundary conditions for the MHD simulation. Particle trapping increased greatly after the passage of the interplanetary shocks and ions were energized as these shocks interacted with the Earth's bow shock and magnetosphere.
DE: 2716 Energetic particles, precipitating
DE: 2720 Energetic particles, trapped
DE: 2788 Storms and substorms
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting