Simulation of Radiation Belt Wave-Particle Interactions Using MHD-SDE Methods

Details Simulation of Radiation Belt Wave-Particle Interactions Using MHD-SDE Methods Simulation of Radiation Belt Wave-Particle Interactions Using MHD-SDE Methods

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13c..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM13C-05

Physics

Plasma Physics

[2774] Magnetospheric Physics / Radiation Belts, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Interactions with a variety of plasma waves, including whistler-mode waves, EMIC waves and MHD waves, can cause significant local acceleration and loss, and/or radial transport of radiation belt particles, especially relativistic electrons. In this paper we report on the development of a new computational model designed to comprehensively simulate local acceleration/loss and radial transport in the radiation belts. The model uses bounce-averaged relativistic equations of motion to follow marker particles in the Lyon-Fedder-Mobarry global MHD code. The marker particles are subjected to energy and pitch-angle diffusion by a variety of high-frequency waves, including whistler waves and other ELF/VLF waves, by using stochastic differential equation (SDE) methods to diffusively adjust the marker-particle phase-space coordinates. The marker trajectories are used to construct phase-space densities and particle fluxes using Liouville-theorem weighting techniques similar to particle-in-cell methods. The new simulation model will calculate effects of (i) local acceleration and loss due to interactions with chorus, hiss, and EMIC waves, and magnetosonic equatorial noise, including quasilinear and non-quasilinear nonlinear interactions, and (ii) radial transport, including (but not restricted to) radial diffusion caused by MHD waves, all in a dynamic global magnetosphere.

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