Comparison of MHD-Particle Simulations and Radial Diffusion Calculations of Relativistic Electron Phase-Space Densities for the September 1998 Magnetic Storm

Details Comparison of MHD-Particle Simulations and Radial Diffusion Calculations of Relativistic Electron Phase-Space Densities for the September 1998 Magnetic Storm Comparison of MHD-Particle Simulations and Radial Diffusion Calculations of Relativistic Electron Phase-Space Densities for the September 1998 Magnetic Storm

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm52a..03c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM52A-03

Physics

2720 Energetic Particles, Trapped, 2752 Mhd Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

MHD-particle simulations calculate changes in radiation belt fluxes by following test-particle trajectories in magnetospheric fields obtained from global MHD codes and then using Liouville's theorem to evolve an initial particle distribution. These simulations have been especially successful in describing rapid flux changes during the March 1991 storm [Li et al, GRL 20, 2423 (1993)] and more recently these methods have been used to study transport of radiation belt electrons due to a drift-resonant interaction with magnetospheric ULF waves [Elkington et al, GRL 26, 3273 (1999)]. The ULF-induced transport is apparently diffusive, but the exact form for the diffusion tensor is not known. In an attempt to better understand the ULF-induced diffusion we compare phase-space densities (as a function of adiabatic invariants) which are calculated from the MHD-particle simulations and from solutions of the radial diffusion equation. Results will be presented for the September 1998 magnetic storm. Early results show similarities between the phase-space densities calculated by the two methods but also differences which indicate that in solving the radial diffusion equation a dynamic outer boundary corresponding to the dynamic magnetopause location is needed.

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