Periodicities in Saturn's Magnetosphere: A Riddle Wrapped in a Mystery, Inside an Enigma (Invited)

Details Periodicities in Saturn's Magnetosphere: A Riddle Wrapped in a Mystery, Inside an Enigma (Invited) Periodicities in Saturn's Magnetosphere: A Riddle Wrapped in a Mystery, Inside an Enigma (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm31c..04k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM31C-04

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2756] Magnetospheric Physics / Planetary Magnetospheres

Scientific paper

Several decades have passed since the periodicity of radio emissions from Saturn’s magnetosphere was first reported. The very existence of variations of the intensity of radio emissions at close to Saturn’s rotation period is a riddle that we have not solved. The periodicity is hard to understand, given that the best analysis to date finds that the internal magnetic field is axisymmetric, so what imposes an electromagnetic asymmetry that modulates the intensity? Continued observations revealed that the period drifts. If the source of asymmetry is some as-yet-undiscovered magnetic anomaly internal to Saturn and reflects the rotation period of the planet, it would not be expected to change period detectably on a time scale of months and years. So the mystery is what imposes a drifting periodicity? And that’s not all. More recent work has shown that periods in the north and south differ considerably (12.9 minutes out of ~640 minutes, but this number is a function of time). So there is the enigma. How can the periodicities differ in two hemispheres? A brief discussion of the periodic phenomena observed at Saturn will be supplemented with a discussion of possible interpretations of the source of the periodic structure.

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