Effects of magnetic field asymmetry and compressional magnetic perturbations on radial diffusion of radiation belt electrons

Details Effects of magnetic field asymmetry and compressional magnetic perturbations on radial diffusion of radiation belt electrons Effects of magnetic field asymmetry and compressional magnetic perturbations on radial diffusion of radiation belt electrons

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm41a1118f&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM41A-1118

Physics

2149 Mhd Waves And Turbulence, 2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions

Scientific paper

The radial diffusion coefficient of particles in a symmetric magnetic field perturbed by fluctuating electric fields is well known to depend on the power spectral density of the electric field at frequencies ω = m ω d (where m is the azimuthal mode number, ω d is the particle drift frequency) with an L6 factor. In this work we have derived a radial diffusion coefficient for particles in an asymmetric magnetic field. The asymmetric diffusion coefficient depends on electric field power at resonance frequencies ω = (m ± 1) ω d with L12 dependence multiplying the power spectral density. Numerical diffusion rates obtained using test-particle simulations in model fields agree well with the analytical diffusion coefficients. Solutions of the radial diffusion equation for the September 1998 storm event are compared to an MHD-particle simulation. Earlier calculations used only electric-field diffusion coefficients, which had to be increased by a factor of 2 to 3 to get the best match with the MHD-particle results. New results will be presented of a radial diffusion calculation with compressional ULF waves added.

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