Auroral Hiss-Like Emissions Observed by Cassini Near the Rings of Saturn

Details Auroral Hiss-Like Emissions Observed by Cassini Near the Rings of Saturn Auroral Hiss-Like Emissions Observed by Cassini Near the Rings of Saturn

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p51a1409x&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P51A-1409

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7871 Waves And Instabilities, 5737 Magnetospheres (2756), 5759 Rings And Dust, 2772 Plasma Waves And Instabilities

Scientific paper

During the Cassini spacecraft pass over the rings of Saturn on July 1, 2004, a well-defined funnel-shaped electric field emission was detected by the plasma wave instrument onboard the spacecraft. The funnel-shaped emission has spectral characteristics that are 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 and it is found that the low altitude boundary of the source is located very close to the B ring at a distance near the synchronous rotation point in the rings. At Earth, such auroral hiss emissions are 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 field-aligned beams and currents similar to those occurring in Earth's auroral regions.

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