A Survey of Electron Beams Associated With Saturnian Auroral Hiss

Details A Survey of Electron Beams Associated With Saturnian Auroral Hiss A Survey of Electron Beams Associated With Saturnian Auroral Hiss

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm54b..08k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM54B-08

Physics

[2700] Magnetospheric Physics, [2704] Magnetospheric Physics / Auroral Phenomena, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

Over the last three years, the Cassini spacecraft underwent a series of high 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 spectrogram 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. Recent efforts have focused on integrating RPWS data with that from other instruments, particularly from the CAPS-ELS investigation. Electron beams are known to be the source of auroral hiss emission at Earth, and it is generally believed the same is true at Saturn. Current work has focused on correlating these beams with the observed radio emission, along with modeling the beams to calculate their growth rates. One electron beam has already been analyzed from the high-latitude pass on October 17, 2008. This beam was determined to be propagating upward from Saturn, and has been found to produce a large whistler-mode growth rate, which fits with the auroral hiss model. More electron beams will be analyzed in this fashion over the coming months. These results will be the focus of this presentation.

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