Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13f..05l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13F-05
Physics
Plasma Physics
[2700] Magnetospheric Physics, [5737] Planetary Sciences: Fluid Planets / Magnetospheres, [6275] Planetary Sciences: Solar System Objects / Saturn, [7800] Space Plasma Physics
Scientific paper
We analyze a large SKR data set recorded by the RPWS instrument aboard Cassini, in orbit around Saturn (namely all available data between 2006 and mid-2010, when Cassini was at close distance (< 10 Rs) from Saturn). By using direction finding and polarisation capabilities of the instrument, we confirm that SKR is statistically associated with auroras from the main oval (invariant latitude ~72°), in both North and South hemispheres. More surprisingly, we find that the SKR apparent location is constrained by observer's position, both in longitude and latitude with respect to Saturn. This provides a simple explanation for the change of SKR polarisation state (circular to linear), when Cassini leaves equatorial regions during high inclination orbits. Moreover some estimation of electron densities above auroral regions is provided by analyzing Faraday rotation of the SKR linearly polarized component.
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