Formation of Saturn's ring spokes by lightning-induced electron beams

Details Formation of Saturn's ring spokes by lightning-induced electron beams Formation of Saturn's ring spokes by lightning-induced electron beams

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3321202j&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 21, CiteID L21202

Physics

11

Atmospheric Processes: Lightning, Planetary Sciences: Fluid Planets: Rings And Dust, Planetary Sciences: Fluid Planets: Atmospheres (0343, 1060), Planetary Sciences: Fluid Planets: Interactions With Particles And Fields, Planetary Sciences: Solar System Objects: Planetary Rings

Scientific paper

Spokes are near-linear markings sometimes visible on Saturn's rings. They are widely accepted as being electrostatically-levitated sheets of ~0.6 micron-radius charged grains. Previously-suggested causes of the grains' charging do not agree with all spoke characteristics, which include their rapid generation, localized formation primarily in Saturn's midnight-dawn sector, the seasonality of their apparitions, and, crucially, their morphologies. We contend that spokes are caused by lightning-induced electron beams striking the rings, at locations magnetically-connected to thunderstorms. This view is supported by a semi-quantitative spoke morphology simulation. Spokes' formation locations are further controlled by Saturn's ionospheric density, which reaches a near-dawn minimum where electron beams can most easily propagate to the rings. The beams may generate observed X-ray emission, supply particles to Saturn's radiation belts, and over time will modify the rings' constituents. Finally, we report Cassini MIMI instrument observations of an electron burst which displays some characteristics expected of a lightning-induced event.

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