Fine structure of storm-time chorus

Details Fine structure of storm-time chorus Fine structure of storm-time chorus

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52a0556s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM52A-0556

Physics

2772 Plasma Waves And Instabilities, 6939 Magnetospheric Physics, 6984 Waves In Plasma, 7871 Waves And Instabilities

Scientific paper

We discuss the lower band of chorus emissions below one half of the electron cyclotron frequency, measured in the source region by the four Cluster spacecraft during a geomagnetically disturbed period. We analyze the wave vector directions and Poynting flux, and we demonstrate the dynamic character of chorus sources. The electric field waveforms of chorus elements show a fine structure consisting of wave packets with a maximum amplitude above 30 mV/m. We analyze this fine structure using a sine-wave parametric model with a variable amplitude. Simultaneous observations on the four Cluster spacecraft show that the characteristic scale of the fine structure appears to be much smaller than the characteristic scale of the chorus elements. Using delays of time-frequency curves obtained on different spacecraft, we deduce the propagation direction. Our observations show antiparallel propagation directions for two neighboring chorus elements, less than 0.1 s apart.

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