Narrowband Z-mode emissions interior to Saturn's plasma torus

Details Narrowband Z-mode emissions interior to Saturn's plasma torus Narrowband Z-mode emissions interior to Saturn's plasma torus

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11010204f&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A10, CiteID A10204

Physics

7

Planetary Sciences: Fluid Planets: Interactions With Particles And Fields, Planetary Sciences: Fluid Planets: Magnetospheres (2756), Planetary Sciences: Fluid Planets: Tori And Exospheres, Planetary Sciences: Fluid Planets: Rings And Dust, Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

During Cassini's close approach to Saturn, on 1 July 2004, a set of narrow bandwidth plasma emissions were detected by the Radio and Plasma Wave Science (RPWS) instrument in the inner magnetosphere. These discrete tones were detected between 3 and 70 kHz, with individual tone bandwidths as low as a few hundred Hertz. The tones persisted for long times (~1 hour) as Cassini flew in planetocentric radial distances of less than 2.5 Rs. During this time at lower radial distances, the spacecraft passed inside the inner edge of a clear and distinct plasma torus; this torus is located between 2.2 and ~10 Rs. We describe the emissions, and demonstrate that the mode of propagation is the Z-mode. The emissions are found to originate at locations where electron plasma oscillations along the plasma torus edge are relatively intense. We describe a mechanism for fp electrostatic-to-electromagnetic wave conversion to explain the origin of the narrowband Z-mode tones. The tones allow remote-sensing of the plasma torus and indicate that the torus is dynamic, with changes in density in the tens of percent over the course of an hour.

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