Effects of off-diagonal terms and oblique wave propagation on calculations of radiation belt electron fluxes

Details Effects of off-diagonal terms and oblique wave propagation on calculations of radiation belt electron fluxes Effects of off-diagonal terms and oblique wave propagation on calculations of radiation belt electron fluxes

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0332t&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0332

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2774 Radiation Belts

Scientific paper

Cyclotron-resonance interactions with whistler-mode chorus waves are thought to be an important mechanism for energizing electrons in the radiation belts. With a recently developed code, which uses Monte Carlo SDE (stochastic differential equation) methods to solve the bounce-averaged energy-pitch-angle quasilinear diffusion equation, we have investigated the effects of (i) ignoring off-diagonal diffusion terms, and (ii) assuming purely parallel-propagating waves. For diffusion coefficients corresponding to a model of storm-time chorus waves at L = 4.5, we find that at small pitch angles ignoring off-diagonal terms overestimates particle flux by as much as a factor of 2~5 for 0.5 MeV electrons, and by more than an order of magnitude for 2 MeV electrons. The parallel propagation assumption leads to errors of more than an order of magnitude in flux for both 0.5 MeV and 2 MeV electrons at some equatorial pitch-angles. For pitch angles near 90 degrees the effects of ignoring off- diagonal terms and oblique waves are relatively small, but overall these effects should be included to obtain more accurate particle fluxes.

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