Modeling Geomagnetic Storms on Prompt and Diffusive Time Scales

Physics

Scientific paper

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[2774] Magnetospheric Physics / Radiation Belts

Scientific paper

We have studied the effects of magnetic storms on the evolution of the electron radiation belts, using two types of numerical simulation code: radial diffusion and MHD test-particle simulation code. Two types of magnetic storms are considered: strong CME-driven storms and CIR-driven storms typical of the solar cycle declining phase. We analyzed electron flux and phase space density for July 2004 and November 2004 CME-storm intervals and compared the results with GPS satellite measurements within 5 degrees of the magnetic equator at L=4.16. The 2D guiding center code developed by Elkington is used to simulate particle motion in the equatorial plane in the MHD fields calculated from the Lyon-Fedder-Mobarry global MHD code. Our goal is to compare the results in the two cases from the two codes and explore both the diffusive and nondiffusive acceleration processes. We also studied two moderate CIR-driven storms during the Whole Heliosphere Interval, March 20-April 16, 2008. The latter are well characterized by the radial diffusion code.

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