Cause of the Saturn Plasma Periodicity

Details Cause of the Saturn Plasma Periodicity Cause of the Saturn Plasma Periodicity

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm41b..07b&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM41B-07

Physics

2723 Magnetic Reconnection (7526, 7835), 2784 Solar Wind/Magnetosphere Interactions, 5737 Magnetospheres (2756)

Scientific paper

The longitude dependence of plasma enhancements in the newly-defined SLS3 system is examined for all Cassini orbits during the time period Dec. 29, 2005 to Sept. 7, 2006. It is found statistically that the events are centered on SLS3 longitude 0° at radial distances near 20 Saturn radii with gradually larger W longitudes occurring for larger distances, reaching 180°W by 48 Saturn radii. This dependence represents a lag caused by plasma loading of magnetic flux tubes. Magnetic-field data within the events show signatures of neutral-sheet crossings and magnetic reconnection. It is hypothesized that the SKR events, which occur when SLS3 100°W is near local noon, result from dayside reconnection. If nightside reconnection occurs approximately one hour later (as suggested by Cassini ENA images), then its occurrence near 21 hrs local time would produce the plasmoid signatures observed in the tail region by the Cassini plasma and magnetic-field sensors.

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