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A diffusive equilibrium model for the plasma density in Saturn's magnetosphere
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2009 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 114, no 4, A04211- p.Article in journal (Refereed) Published
Abstract [en]

Electron density measurements have been obtained by the Cassini Radio and Plasma Wave Science (RPWS) instrument for more than 50 passes through Saturn's inner magnetosphere from 30 June 2004 to 30 September 2007. The electron densities are derived from RPWS measurements of the upper hybrid resonance frequency and span latitudes up to 35 degrees and L values from 3.6 to 10. The electron density measurements are combined with ion anisotropy measurements from the Cassini Plasma Spectrometer (CAPS) and electron temperature measurements from the RPWS and CAPS to develop a diffusive equilibrium model for the distribution of water group ions, hydrogen ions, and electrons in the inner region of Saturn's magnetosphere. The model uses an analytical solution of the field-aligned force equation, including the ambipolar electric field, to determine the equatorial ion densities and scale heights as a function of L. Density contour plots for water group ions, hydrogen ions, and electrons are presented.

Place, publisher, year, edition, pages
2009. Vol. 114, no 4, A04211- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-148696DOI: 10.1029/2008JA013912ISI: 000265675600006OAI: oai:DiVA.org:uu-148696DiVA: diva2:402854
Available from: 2011-03-10 Created: 2011-03-09 Last updated: 2017-12-11Bibliographically approved

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Swedish Institute of Space Physics, Uppsala Division
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