Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm32a..05a&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM32A-05
Other
2720 Energetic Particles: Trapped, 2753 Numerical Modeling, 2774 Radiation Belts
Scientific paper
Cyclotron-resonant wave-particle interactions are thought to be a crucial ingredient in the production and loss of energetic particles in the outer radiation belts, and are often modeled by a quasilinear diffusion equation. This equation can be written as a pitch angle diffusion term plus an energy diffusion term plus two cross diffusion terms. Spatial transport of high energy electrons is often also described by diffusion, which is usually taken to be purely in the radial variable L, but there are many mechanisms whereby L couples to other variables, leading again to mixed diffusion terms and possibly a full 3x3 diffusion tensor. Little attention has been paid to these mixed terms, partly because of the numerical difficulties they involve. A technique has recently been used to rigorously transform away the cross terms in 2D pitch angle/energy diffusion, allowing a detailed simulation of energization by chorus waves. Here, progress is reported on extending the approach to 3D, to include radial diffusion and the possible additional mixed terms associated with it.
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