Time variability in Saturn's magnetic rotation

Details Time variability in Saturn's magnetic rotation Time variability in Saturn's magnetic rotation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p52a..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P52A-08

Other

2721 Field-Aligned Currents And Current Systems (2409), 2756 Planetary Magnetospheres (5443, 5737, 6033), 5734 Magnetic Fields And Magnetism

Scientific paper

Magnetometer data from the Cassini Saturn orbiter spacecraft are analysed with the aim of distinguishing a Saturn rotation rate and possible time variation in it from the repeatable `cam shaft' signature seen on each periapsis. The cam signal (outward displacement in one longitude hemisphere and inward in the other) that is used appears to be generated by a rotating field aligned current system which is also likely to be the seat of the radio signal. Using the hypothesis of phase conservation between periapsis passes, it is shown that the magnetic rotation period has a time scale for evolution of years like that reported for the SKR planetary radio signal. Deviations from expectations are described as are implications for determination of a longitude system and defining deep rotation rates.

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