Journal article
Elliptical polarization of Saturn Kilometric Radiation observed from high latitudes
Journal of geophysical research. Space physics, Vol.114(A08216), pp.08216-n/a
08/27/2009
DOI: 10.1029/2009JA014176
Abstract
The high-inclination orbits of the Cassini spacecraft from autumn 2006 until spring 2007 allowed the Cassini/RPWS (Radio and Plasma Wave Science) instrument to observe Saturn Kilometric Radiation (SKR) from latitudes up to 60° for the first time. This has revealed a surprising new property of SKR: above ˜30° in observational latitude, a significant amount of SKR is strongly elliptically polarized, in marked contrast to previous observations from low latitudes, which showed only circular polarization. There are transitional latitudes where the elliptical polarization occurs in ``patches'' in the time-frequency spectrograms next to regions of still completely circularly polarized SKR. From ˜45° to 60° in northern latitude, it is found that most of the SKR is elliptically polarized throughout its entire frequency range with an average degree of ˜0.7 in linear polarization. We demonstrate the ellipticity of SKR by using the concept of ``apparent polarization'' in case of two-antenna measurements, but also show three-antenna measurements from which the polarization can be unambiguously determined. Possible reasons for the variation of SKR polarization with the observer's latitude will be discussed.
Details
- Title: Subtitle
- Elliptical polarization of Saturn Kilometric Radiation observed from high latitudes
- Creators
- Georg Fischer - University of IowaBaptiste Cecconi - Observatoire de ParisLaurent Lamy - Laboratoire d’études spatiales et d’instrumentation en astrophysiqueSheng-Yi Ye - Iowa State UniversityUlrich Taubenschuss - Space Research InstituteWolfgang Macher - Space Research InstitutePhilippe Zarka - Laboratoire d’études spatiales et d’instrumentation en astrophysiqueWilliam S. Kurth - University of IowaDonald A. Gurnett - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.114(A08216), pp.08216-n/a
- Publisher
- American Geophysical Union/Wiley
- DOI
- 10.1029/2009JA014176
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Language
- English
- Date published
- 08/27/2009
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455284702771
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