3D simulations of the dynamics of the Radiation Belts including mixed diffusion

Details 3D simulations of the dynamics of the Radiation Belts including mixed diffusion 3D simulations of the dynamics of the Radiation Belts including mixed diffusion

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1576s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1576

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2722] Magnetospheric Physics / Forecasting, [2753] Magnetospheric Physics / Numerical Modeling, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

The evolution of the relativistic electron fluxes in the Radiation Belts may be described by the 3D modified Fokker-Planck equation in terms of radial distance, pitch-angle, and energy. We present the results of numerical simulations using the 3D Versatile Electron Radiation Belt (VERB) code newly developed at UCLA. Quasi-liner diffusion coefficients are computed for resonance scattering by hiss waves inside plasmasphere, chorus waves outside plasmasphere, and EMIC and hiss waves in the regions of plumes. The Fokker-Planck equation has diagonal and mixed diffusion terms, the second is usually excluded from the models. We present a numerical solution of the Fokker-Planck equation including mixed diffusion terms. We use finite differences method and implicit numerical scheme, which is stable for any given time step. We discuss the mixed terms effect and show a detailed comparison of the simulations including and excluding mixed diffusion terms. Results of simulations are compered with CRRES observations for selected storms.

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