Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 118, Issue 6, Pages 2970-2974Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/jgra.50182
Keywords
Plasma density; Density model; Saturn's magnetosphere
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Funding
- NASA [1415150]
- Jet Propulsion Laboratory
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Electron density measurements derived from the upper hybrid resonance frequency have been obtained from the Cassini Radio and Plasma Wave Science experiment over a 7 year period from 28 October 2004 through 7 November 2011. Additional density measurements inside the orbit of Enceladus and outside the orbit of Rhea have made it possible to expand a previously published density model to radial distances from 2.6 to 10.0 Saturnian radii (R-S). The distribution of density data is compared to a simple scale height density model for a single-species plasma within 8 degrees of the magnetic equatorial plane. There is a broad peak in the equatorial density distribution between 4 R-S and 5 R-S with the plasma falling off both inward and outward from the peak region. The radial dependence of the equatorial density profile varies as R-4.0 from 2.6 R-S to 4 R-S and as R-4.8 from 5 R-S to 10 R-S. The plasma distribution outside 5 R-S remains consistent with earlier density models but additional density measurements inside 4 R-S provide information on the plasma distribution in this inner region that will be the focus of the F-Ring and proximal orbits near the end of the Cassini mission.
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