A Multi-Instrument Study of Auroral Hiss Emissions at Saturn Observed With Cassini

Details A Multi-Instrument Study of Auroral Hiss Emissions at Saturn Observed With Cassini A Multi-Instrument Study of Auroral Hiss Emissions at Saturn Observed With Cassini

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm34a..06k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM34A-06

Physics

Plasma Physics

2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 6275 Saturn, 7800 Space Plasma Physics

Scientific paper

Over the last two years, the Cassini spacecraft has undergone a series of higher inclination orbits, allowing investigation and measurements of the Saturnian auroral zone. The Radio and Plasma Wave Science (RPWS) Investigation has detected low frequency funnel-shaped whistler mode emissions along the auroral field lines, much like the auroral hiss observed at Earth. The poleward and equatorward flaring of the auroral hiss funnel on the frequency-time spectrograms is the result of whistler mode waves propagating upward into a region of diminishing plasma density. These detections are important in understanding the auroral processes occurring at Saturn. The emissions usually display two periodicities, one on a short time scale of roughly one hour and a second on a time scale on the order of the SKR period. The short term variability appears to align with the one-hour periodic bursts of upward propagating field-aligned electrons at energies of tens to hundreds of keV. These detections also correlate well to the field-aligned currents observed at Saturn. Ray tracing calculations are underway to explain the funnel shape and determine the source position.

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