Physics – Plasma Physics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3801106c&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 1, CiteID L01106
Physics
Plasma Physics
5
Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Space Plasma Physics: Kinetic Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena (4400, 6944), Magnetospheric Physics: Radiation Belts
Scientific paper
Chorus emissions are a striking feature of the electromagnetic wave environment in the Earth's magnetosphere. These bursts of whistler-mode waves exhibit characteristic frequency sweeps (chirps) believed to result from wave-particle trapping of cyclotron-resonant particles. Based on the theory of Omura et al. (2008), we predict the sweep rates of chorus elements observed by the THEMIS satellites. The predictions use independent observations of the electron distribution functions and have no free parameters. The predicted chirp rates are a function of wave amplitude, and this relation is clearly observed. The predictive success of the theory lends strong support to its underlying physical mechanism: cyclotron-resonant wave-particle trapping.
Angelopoulos Vassilis
Auster Uli
Bonnell Jerry
Cully C. M.
Le Contel Olivier
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