Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53a1370a&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53A-1370
Physics
Plasma Physics
[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2774] Magnetospheric Physics / Radiation Belts, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Wave-particle interactions are well established as an important mechanism driving the dynamic behavior of the radiation belts. These interactions have frequently been modeled by bounce-averaged quasilinear diffusion. A recent 3D simulation including radial diffusion and pitch angle, energy, and cross diffusion by chorus waves successfully reproduced much of the observed behavior of outer zone electrons during the October 9, 1990 magnetic storm. On the other hand, the validity of this approach is questionable for waves with large amplitudes and/or manifest coherence, as has been observed for both whistler mode chorus and EMIC waves. For single waves, theoretical and numerical studies of test particle behavior can also lead to diffusion, along with the nonlinear phenomena of phase bunching and phase trapping. An earlier study found a close relation between the two diffusive descriptions in the case of low frequency whistler waves in the high density approximation. Here, this is generalized to show analytically that the single wave-induced diffusion rate, suitably averaged over the parameters of the wave, is exactly equal to the expression for bounce-averaged quasilinear diffusion. This result holds for any type of cold plasma wave, providing a link between the quasilinear and nonlinear paradigms. The inclusion of nondiffusive (phase bunching and phase trapping) interactions in the framework of a modified Fokker-Planck (diffusive-advective) equation is also discussed.
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