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A plasmapause-like density boundary at high latitudes in Saturn's magnetosphere
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2010 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 37, L16806- p.Article in journal (Refereed) Published
Abstract [en]

Here we report the discovery of a well-defined plasma density boundary at high latitudes in Saturn's magnetosphere. The boundary separates a region of relatively high density at L less than about 8 to 15 from a region with densities nearly three orders of magnitude lower at higher L values. Magnetic field measurements show that strong field-aligned currents, probably associated with the aurora, are located just inside the boundary. Analyses of the anisotropy of energetic electrons show that the magnetic field lines are usually closed inside the boundary and open outside the boundary, although exceptions sometimes occur. The location of the boundary is also modulated at the similar to 10.6 to 10.8 hr rotational period of the planet. Many of these characteristics are similar to those predicted by Brice and Ioannidis for the plasmapause at a strongly magnetized, rapidly rotating planet such as Saturn.

Place, publisher, year, edition, pages
2010. Vol. 37, L16806- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-147269DOI: 10.1029/2010GL044466ISI: 000281138200006OAI: oai:DiVA.org:uu-147269DiVA: diva2:400236
Available from: 2011-02-25 Created: 2011-02-24 Last updated: 2017-12-11Bibliographically approved

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Swedish Institute of Space Physics, Uppsala Division
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