Variations in the Rotational Modulation of Saturn Kilometric Radiation and Their Relationship to Magnetic Periodicities Observed Before and Near Equinox

Details Variations in the Rotational Modulation of Saturn Kilometric Radiation and Their Relationship to Magnetic Periodicities Observed Before and Near Equinox Variations in the Rotational Modulation of Saturn Kilometric Radiation and Their Relationship to Magnetic Periodicities Observed Before and Near Equinox

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm31c..06g&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM31C-06

Physics

[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2756] Magnetospheric Physics / Planetary Magnetospheres, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

Saturn kilometric radiation (SKR), which is an intense radio emission generated at high latitudes in Saturn's magnetosphere, displays a strong rotationally driven modulation at two rates, one characteristic of radiation from the northern auroral zone, and the other from the southern auroral zone. During the period from about 2007 to 2009, Cassini observations show that the rotation rates were about 816 and 780 deg/day, corresponding to rotational periods of about 10.6 and 10.8 hr. However, as Saturn approached equinox in August 2009, the two rotation rates began to converge, and have since crossed in early 2010. This interchange of the rotational modulation rates of SKR in the two hemispheres potentially provides an important clue as to how angular momentum is transferred from the interior of Saturn to the magnetosphere. Using these measurements a new longitude system has been developed, one for the northern hemisphere and one for the southern hemisphere (SLS4-N and SLS4-S). These longitude systems are used to investigate similar variations in the rotational modulation of Saturn's magnetic field and field-aligned currents.

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