Simulation of the acceleration of relativistic electrons in the inner magnetosphere using RCM-VERB coupled codes
Article first published online: 6 AUG 2011
Copyright 2011 by the American Geophysical Union.
Journal of Geophysical Research: Space Physics (1978–2012)
Volume 116, Issue A8, August 2011
How to Cite
2011), Simulation of the acceleration of relativistic electrons in the inner magnetosphere using RCM-VERB coupled codes, J. Geophys. Res., 116, A08211, doi:10.1029/2010JA016350., , , , , , , , , and (
- Issue published online: 6 AUG 2011
- Article first published online: 6 AUG 2011
- Manuscript Accepted: 18 MAY 2011
- Manuscript Revised: 9 MAR 2011
- Manuscript Received: 6 DEC 2010
- magnetospheric convection;
- models coupling;
- radiation belts
 Radiation belt dynamics have been modeled by the modified Fokker-Planck diffusion equation with sources from the low-energy plasma sheet population and losses to the atmosphere and magnetopause. We perform a coupled simulation of the Rice Convection Model (RCM) and Versatile Electron Radiation Belt (VERB) code. The RCM models magnetospheric convection and provides a low-energy electron seed population for the VERB diffusion code simulations of the Earth's radiation belts. VERB simulations are driven by the realistic time-dependent electron seed population and by the Kp index, which is used to specify rates of diffusion by ultralow frequency (ULF) and very low frequency wave activity and, therefore, diffusion processes. Radial diffusion is produced by ULF waves, while pitch angle and energy diffusion are produced by chorus waves outside the plasmasphere and by hiss waves inside the plasmasphere. The results of the simulation indicate that storm time enhanced magnetospheric convection combined with radial diffusion can bring electrons with tens of keV energy close to the Earth and can affect electron fluxes at 3–4 RE. These electrons can be further accelerated locally by chorus waves to MeV energies. Furthermore, outward radial diffusion smooths out the peak of the high-energy fluxes and produces MeV electron enhancement around geosynchronous orbit (6–7 RE) despite the absence of local electron acceleration in that region. Our coupled simulations indicate that local acceleration in the inner magnetosphere may be a dominant source of relativistic electrons that reach geosynchronous orbit.