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Transverse Dimensions of Chorus in the Source RegionWe 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.
Document ID
20030067609
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Santolik, O.
(Iowa Univ. Iowa City, IA, United States)
Gurnett, D. A.
(Iowa Univ. Iowa City, IA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Geophysical Research Letters
Publisher: American Geophysical Union
Volume: 30
Issue: 2
ISSN: 0094-8276
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-9974
CONTRACT_GRANT: MSM-113200004
CONTRACT_GRANT: GACR-205/02/0947
CONTRACT_GRANT: ME-467
Distribution Limits
Public
Copyright
Other

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