Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm11a2009c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM11A-2009
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
Since the discovery of dual periodicities in Saturn's kilometric radiation (SKR), similar dual periods have been putatively observed in energetic charged particles, energetic neutral atoms, low energy plasma, and magnetic field oscillations. Ostensibly, one period (~10.8 hours) derives from a source in the southern hemisphere, while the second period (~10.6 hours) derives from a source in the northern hemisphere. Recent work on SKR, however, has demonstrated that at least southern SKR simultaneously oscillates at both frequencies. Recent work in the magnetic field oscillations further indicates that dual periodicities can sporadically arise from "beating" of Cassini's orbit with the single southern period. A rotating spiral configuration of the plasma sheet can readily produce dual periods in energetic particle data when considered along the Cassini trajectory. Furthermore, solar wind modulation at ~26 days of any "carrier" phenomena at ~10.7 hours will generate a dual frequency spectrum very similar to that observed in the SKR, as well as Saturn's particles and fields. This presentation suggests that Saturn's magnetosphere really has only one fundamental (carrier) period and that dual (or even multiple) periodicities arise when this fundamental is amplitude-modulated by an external driver such as the solar wind, Titan, or even the orbit of Cassini!
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