Dual Periodicity in the Rotational Modulation of Saturn Narrowband Emissions

Details Dual Periodicity in the Rotational Modulation of Saturn Narrowband Emissions Dual Periodicity in the Rotational Modulation of Saturn Narrowband Emissions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p51f1185y&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P51F-1185

Physics

Plasma Physics

[2756] Magnetospheric Physics / Planetary Magnetospheres, [6275] Planetary Sciences: Solar System Objects / Saturn, [6964] Radio Science / Radio Wave Propagation, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Using the Cassini Radio and Plasma Wave Science (RPWS) instrument it has recently been shown that the rotational modulation period of Saturn Kilometric Radiation (SKR) has two components, one with a period of 10.6 hours and the other with a period of 10.8 hours. The longer period is primarily observed in the northern hemisphere and the shorter period primarily observed in the southern hemisphere. In this presentation, the modulation period of 5 kHz Saturn narrowband radio emissions is examined, restricting the spacecraft location to either the northern or the southern hemisphere of Saturn. It is found that in both hemispheres, the modulation period of 5 kHz narrowband emissions has two components which are equal to the SKR periods. It is known that Saturn narrowband emissions are first generated as Z-mode and then mode converted to escaping L-O modes at density gradients. These Z-modes are trapped in a region close to the planet and could propagate from hemisphere to hemisphere before mode converting to L-O modes , leading to dual periods of Saturn narrowband emissions at each hemisphere.

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