Generation mechanism of chorus emissions in the dayside magnetosphere

Details Generation mechanism of chorus emissions in the dayside magnetosphere Generation mechanism of chorus emissions in the dayside magnetosphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm42c0626h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM42C-0626

Physics

2731 Magnetosphere: Outer, 2772 Plasma Waves And Instabilities, 6984 Waves In Plasma

Scientific paper

The chorus emissions have been observed by the GEOTAIL spacecraft around the equatorial plane in the dayside outer magnetosphere. We analyze the wave - particle interaction involved in the generation and propagation of the chorus emissions. The chorus emissions are generally considered as generated via the cyclotron resonance between electrons and whistler mode waves. Detailed examination of the measured velocity distributions of the resonant electrons has shown that their pitch angle anisotropy is too small to generate simultaneously observed chorus emissions via linear cyclotron resonance. This seems to be caused by the pitch angle scattering of cyclotron resonant electrons due to the generated chorus emissions.
The whistler mode wave first grows linearly and incoherently within a certain frequency band. The unstable pitch angle anisotropy of the resonant electrons is pitch - angle scattered by the linear cyclotron interaction and rapidly reduced to the small "critical anisotropy." With such a reduced anisotropy the linear cyclotron interaction can no longer be sustained. The pitch angle scattering occurs within much less than 1 second, which is quite short enough compared with the time resolution of GEOTAIL particle measurements (several tens of seconds). This would suggest that we could observe only the "already well-reduced and marginally stable anisotropy" with GEOTAIL. In this study, by means of theoretical analysis and particle simulation, we investigate the cyclotron resonance and pitch angle diffusion of the resonant electrons, to analyze the generation mechanism of the chorus emissions.

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