The Polarization of Saturn Electrostatic Discharges

Details The Polarization of Saturn Electrostatic Discharges The Polarization of Saturn Electrostatic Discharges

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p52a..07f&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P52A-07

Physics

3324 Lightning, 6275 Saturn, 6984 Waves In Plasma (7867)

Scientific paper

Early in 2006 the RPWS (Radio and Plasma Wave Science) and the ISS (Imaging Science Subsystem) instruments onboard the Cassini spacecraft detected a lightning storm on Saturn that lasted for about one month. The RPWS measured the so-called SEDs (Saturn Electrostatic Discharges), which are high frequency radio signals produced by lightning discharges. The ISS imaged a remarkable cloud system associated with these SEDs at a latitude of 35 deg. South. Below the frequency of 1825 kHz the RPWS was in a mode capable of measuring the polarization of the SEDs. A surprising result was gained, SEDs appeared to be highly polarized (80%) and were exclusively right-hand polarized with a high degree of circular polarization. We will present a preliminary explanation for this diagnosis involving mode-splitting and damping of radio waves in the magnetoplasma of Saturn's ionosphere.

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