Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm14b..06c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM14B-06
Physics
Plasma Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Chorus emissions are a striking feature of the electromagnetic wave environment near Earth's radiation belts. These bursts of whistler-mode waves exhibit characteristic frequency sweeps (chirps) believed to result from nonlinear wave-particle interactions. Based on the theory of Omura [2008], we demonstrate how to predict the chirp rate of observed chorus elements. The predicted chirp rates are a function of the wave amplitude, and are calculated from available observations leaving no free parameters. We test these predictions against observations from the THEMIS satellites. The predictions agree well with the observations, both in terms of the absolute sweep rates and their relation to the wave amplitudes, lending strong support to the theory that these waves are the result of cyclotron-resonant wave-particle trapping.
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