Physics
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30b...3s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 2, pp. 3-1, CiteID 1031, DOI 10.1029/2002GL016178
Physics
28
Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Magnetosphere-Inner, Radio Science: Magnetospheric Physics, Radio Science: Waves In Plasma, Magnetospheric Physics: Ring Current
Scientific paper
We report measurement of whistler-mode chorus by the four Cluster spacecraft at close separations. We focus our analysis on the generation region close to the magnetic equatorial plane at a radial distance of 4.4 Earth's radii. We use both linear and rank correlation analysis to define perpendicular dimensions of the sources of chorus elements below one half of the electron cyclotron frequency. Correlation is significant throughout the range of separation distances of 60-260 km parallel to the field line and 7-100 km in the perpendicular plane. At these scales, the correlation coefficient is independent for parallel separations, and decreases with perpendicular separation. The observations are consistent with a statistical model of the source region assuming individual sources as gaussian peaks of radiated power with a common half-width of 35 km perpendicular to the magnetic field. This characteristic scale is comparable to the wavelength of observed waves.
Gurnett Donald A.
Santolik Ondrej
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