A microscopic and nanoscopic view of storm-time chorus

Details A microscopic and nanoscopic view of storm-time chorus A microscopic and nanoscopic view of storm-time chorus

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51c0552s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM51C-0552

Mathematics

Probability

2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities, 7871 Waves And Instabilities

Scientific paper

We use multipoint measurements obtained by the Cluster spacecraft to investigate intense whistler-mode chorus emissions during the geomagnetic storms. The observations were recorded close to the equatorial plane at a radial distance of 4 Earth radii. We first show a ``microscopic view'' of spatio-temporal variations of the direction of the Poynting flux. We investigate the central position of the chorus source which fluctuates at time scales of minutes within a few thousands km of the geomagnetic equator. We demonstrate that estimates of the electromagnetic planarity can be used to characterize the extent of the source region parallel to the ambient magnetic field. We also show a ``nanoscopic view'' of discrete wave packets of chorus rising in frequency between 1 and 4 kHz at a rate up to 20 kHz/s, and having peak amplitudes above 20 mV/m. We study the fine structure of subpackets embedded in the chorus wave packets. This fine structure has a typical delay of a few milliseconds between the two neighboring maxima of the wave amplitude, while longer delays occur with a decreasing probability density.

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