Observations of Very High Amplitudes of Whistler-Mode Chorus: Consequences for Nonlinear Trapping of Energetic Electrons in the Outer Radiation Belt

Details Observations of Very High Amplitudes of Whistler-Mode Chorus: Consequences for Nonlinear Trapping of Energetic Electrons in the Outer Radiation Belt Observations of Very High Amplitudes of Whistler-Mode Chorus: Consequences for Nonlinear Trapping of Energetic Electrons in the Outer Radiation Belt

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm14b..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM14B-07

Physics

2772 Plasma Waves And Instabilities (2471), 6939 Magnetospheric Physics (2700), 6984 Waves In Plasma (7867), 7839 Nonlinear Phenomena (4400, 6944), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Whistler mode chorus has recently regained attention as a possible agent in acceleration of electrons to relativistic energies in the outer Van Allen belt. As theoretical and simulation studies show, sufficiently high amplitudes of chorus wave packets are needed. We present analysis of observations of high resolution magnetic field waveforms by the four Cluster spacecraft. The results show that chorus can reach amplitudes of several nT but only for a very small fraction of wave packets. We systematically analyze a large data set of measured waveforms to verify signatures of nonlinear wave trapping of energetic electrons. Fine structure embedded in the chorus elements mainly reflects simultaneous presence of waves at different frequencies (sidebands) although separate wave packets are also observed. The observed frequency differences (time scales of subpackets) as a function of wave amplitude are compared to theoretical estimates of the nonlinear trapping frequency.

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