Cassini observations of chorus at Saturn

Details Cassini observations of chorus at Saturn Cassini observations of chorus at Saturn

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1387h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1387

Physics

Plasma Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [5737] Planetary Sciences: Fluid Planets / Magnetospheres, [6984] Radio Science / Waves In Plasma, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

The Cassini Radio and Plasma Wave instrument has detected whistler-mode chorus emissions during many of its one hundred eighteen orbits of Saturn. Unlike at the Earth, the chorus at Saturn is only observed below half the electron cyclotron frequency unless it is detected in association with a local plasma injection event. Furthermore, high-resolution measurements of the chorus show a difference in the time-scale of the fine structure between the chorus associated with plasma injection events (time scales < 1 second) and the more common chorus observations not related to local injection events (time scales of seconds to minutes). Wave normal and Poynting vector measurements from the five-channel Waveform Receiver are used to examine the propagation characteristics of the chorus. The chorus is found to always be propagating away from a region within a few degrees of Saturn's magnetic equator, suggesting a source near the magnetic equator. This work will expand our earlier survey of chorus observations from the first forty-five orbits of Cassini, present the statistical properties of the chorus emissions, and discuss the similarities and differences of the two types of chorus detected at Saturn to observations of chorus at the Earth.

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