Modeling the Transport, Acceleration, and Loss of Energetic Particles During the October 2001 Storm

Details Modeling the Transport, Acceleration, and Loss of Energetic Particles During the October 2001 Storm Modeling the Transport, Acceleration, and Loss of Energetic Particles During the October 2001 Storm

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42a0489j&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42A-0489

Physics

2716 Energetic Particles, Precipitating, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

The development of a predictive geomagnetic storm model is of central interest to the NASA Sun-Earth Connection program. This study addresses processes that need to be understood to achieve this goal. We simulate the ring current-atmosphere interactions during the October 21-25, 2001, storm using our global physics-based model. The storm had a rapid main phase reaching minimum Dst=-166 nT and maximum Kp=8- at ˜22 UT, followed by a period of strong geomagnetic activity lasting for more than a day, and a slow storm recovery. We extend our kinetic model which calculates time-dependent transport and loss to relativistic energies and include radial diffusion. Losses due to charge exchange, Coulomb collisions, wave-particle interactions, and convective drift through the dayside magnetopause are considered. The plasma inflow from the magnetotail as the storm evolves is modeled after measurements from the MPA and SOPA instruments on the LANL spacecraft. The initial conditions are inferred from the HYDRA and MICS instruments on Polar. We investigate the relative effect of magnetospheric convection and radial diffusion on the stormtime injection and trapping of energetic particles. We calculate the excitation of EMIC waves and the resulting precipitating flux of resonant particles. Model results are compared with NOAA and Polar observations. We present global patterns of ring current energy density and study the transition from an asymmetric to a symmetric ring current population as the storm evolves.

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