Energetic Ions in the Magnetosphere during a Magnetic Storm

Details Energetic Ions in the Magnetosphere during a Magnetic Storm Energetic Ions in the Magnetosphere during a Magnetic Storm

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm41a1119r&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM41A-1119

Physics

2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2788 Storms And Substorms

Scientific paper

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.

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