Cassini Observations of Auroral Hiss-Like Emissions Near Saturn's Rings

Details Cassini Observations of Auroral Hiss-Like Emissions Near Saturn's Rings Cassini Observations of Auroral Hiss-Like Emissions Near Saturn's Rings

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusm.p21c..05x&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #P21C-05

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5737 Magnetospheres (2756), 5759 Rings And Dust, 7871 Waves And Instabilities

Scientific paper

A well-defined funnel-shaped electric field emission was detected by the plasma wave instrument onboard the Cassini spacecraft during its pass over the rings of Saturn on July 1, 2004. The funnel-shaped frequency-time characteristic is very similar to a type of whistler-mode emission called 'auroral hiss' that is commonly observed in Earth's auroral region. This is the first detection of such emissions at Saturn. Using a dipole magnetic field and a simple electron density model based on the electron density profile measured by Cassini, ray tracing computations have been performed to explain the funnel-shaped frequency-time spectrum. It is found that the source is located very close to the B ring at a distance of about 1.80 RS (Saturn radii), near the synchronous rotation point in the rings. Terrestrial auroral hiss emissions are known to be caused by field-aligned low-energy (100 eV to 1 keV) electron beams associated with the auroral current system. The existence of similar emissions originating from near Saturn's rings suggest that an electrodynamic interaction between the rings and Saturn's co-rotating magnetospheric plasma may be driving a field-aligned system of beams and currents similar to those occurring in Earth's auroral regions.

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