Nonlinear Phase Bunching of Radiation Belt Electrons

Details Nonlinear Phase Bunching of Radiation Belt Electrons Nonlinear Phase Bunching of Radiation Belt Electrons

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23c..03a&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23C-03

Physics

Plasma Physics

[7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7867] Space Plasma Physics / Wave/Particle Interactions, [7984] Space Weather / Space Radiation Environment

Scientific paper

Electrons interacting with strong, coherent waves experience phase bunching and phase trapping, which tend to have strong but oppositely directed effects on the first adiabatic invariant. For VLF waves propagating away from the equator, phase bunching typically causes both energy and pitch angle to systematically decrease, which may help explain storm time radiation belt dropouts. A simple analytical estimate of the changes has long been available, but direct numerical simulations show a distribution of particle behavior. Here refined expressions are given, and compared to direct test particle simulations. The new results still show preferentially directed adiabatic invariant changes but also capture their spread, suggesting a combined diffusion-advection model in velocity space.

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