Location and correlation of Saturnian Kilometric Radiation (SKR) sources and UV aurorae

Details Location and correlation of Saturnian Kilometric Radiation (SKR) sources and UV aurorae Location and correlation of Saturnian Kilometric Radiation (SKR) sources and UV aurorae

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm34a..08l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM34A-08

Physics

5754 Polar Regions, 6275 Saturn, 6939 Magnetospheric Physics (2700), 6969 Remote Sensing, 7549 Ultraviolet Emissions

Scientific paper

The Saturnian Kilometric Radiation (SKR) is the most intense kronian radio emission. It is an auroral emission similar to the auroral kilometric radiation (AKR) at Earth, supposedly associated with Saturn's polar aurorae. Here we investigate observations relating the SKR sources observed by the Radio Plasma and Wave Science experiment of the Cassini spacecraft to Ultraviolet (UV) aurorae as observed either by the Hubble Space Telescope (HST) or the UVIS instrument onboard Cassini. We take advantage of Cassini-HST combined observations in 2004, 2007 and 2008, during which the SKR was observed quasi-continuously whereas the HST took hundreds of images of Saturn's aurorae spread over more than 30 days. We also use UVIS observations taken when Cassini is located close to the planet (typically below 10 kronian radii). On the one hand, polar projection of UV images allow us to directly derive the intensity, latitude and local time of aurorae. On the other hand, assuming that the SKR is emitted via the Cyclotron Maser Instability, i.e. close to the local electron gyrofrequency, a goniometric (direction-finding) analysis of the data allows to measure the coordinates of the magnetic footprint of field lines carrying radio sources. Comparison of images in these two spectral ranges reveals a close association between SKR and discrete UV aurorae, in spite of the strong visibility effects affecting SKR.

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