The rotation of Saturn's auroral oval

Details The rotation of Saturn's auroral oval The rotation of Saturn's auroral oval

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p23c..05n&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P23C-05

Physics

5706 Aurorae, 5734 Magnetic Fields And Magnetism, 5737 Magnetospheres (2756)

Scientific paper

Near-planetary period oscillations have been observed in all explored regions of Saturn's magnetosphere, despite the fact that Saturn's magnetic and spin axes are closely co-aligned. In addition, the traditional measure of Saturn's rotation period, Saturn kilometric radiation (SKR), has been shown to vary over the timescale of months. We report that Saturn's southern auroral oval rotates with a radius of ~1° and period ~10.7 h, an unexpected result in a supposedly axisymmetric system. The implication of this new observation is either that it reveals the true dipole tilt of Saturn, in which case it represents the first direct observation of the rotation of Saturn's deep interior, or it indicates the presence of an external current system that produces an effect similar to a dipole tilt. Until we observe both poles simultaneously this will remain an ambiguity of the result. In either case, this work places an independent constraint on the dipole tilt of Saturn.

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