Rotating Asymmetries in Saturn’s Ring Current Population: Radial Dependencies

Details Rotating Asymmetries in Saturn’s Ring Current Population: Radial Dependencies Rotating Asymmetries in Saturn’s Ring Current Population: Radial Dependencies

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p51f1183m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P51F-1183

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2756] Magnetospheric Physics / Planetary Magnetospheres, [2778] Magnetospheric Physics / Ring Current, [5719] Planetary Sciences: Fluid Planets / Interactions With Particles And Fields

Scientific paper

Global images of Saturn’s ring current in energetic neutral atom (ENA) emission reveal interesting differences between the inner ring current (7 to 10 Rs) and the outer ring current (12 to 20 Rs). Data from the Magnetospheric Imaging Instrument Ion and Neutral Camera (MIMI-INCA) show that in the outer ring current, enhancements of the ring current by about an order of magnitude usually initiate near midnight, grow in intensity and size as they rotate through dawn to late morning, and die away as they rotate past noon toward dusk. These events are sometimes recurrent with about a 10.8 hour period, and tend to be oxygen rich relative to randomly occurring events, or events closer to the planet. In the 7 to 10 Rs region, rotating ring current enhancements are common, last typically for several rotations, often display a spiral form with a trailing tail reaching to larger radii, and show recurrent enhancements each rotation, growing as they reach the dusk meridian, peaking near midnight, and diminishing as they rotate through the day side magnetosphere. There are sometimes cases in which the two classes of events appear to be correlated, with the inner events appearing to trigger outer events as they reach midnight.

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