Elliptical polarization of Saturn Kilometric Radiation observed from high latitudes

Details Elliptical polarization of Saturn Kilometric Radiation observed from high latitudes Elliptical polarization of Saturn Kilometric Radiation observed from high latitudes

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11408216f&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A8, CiteID A08216

Physics

14

Radio Science: Magnetospheric Physics (2700), Planetary Sciences: Solar System Objects: Saturn, Planetary Sciences: Fluid Planets: Aurorae, Planetary Sciences: Fluid Planets: Magnetospheres (2756), Radio Science: Radio Wave Propagation

Scientific paper

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.

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