Stream Particles as Messengers from Saturn's Rings

Details Stream Particles as Messengers from Saturn's Rings Stream Particles as Messengers from Saturn's Rings

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p51c..09k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P51C-09

Physics

5759 Rings And Dust, 6008 Composition, 6015 Dust

Scientific paper

Beginning in 2004 when the Cassini spacecraft was closer to Saturn than 1200 {RS} (Saturn radius {RS} = 60 330 km), the on-board dust sensor, CDA discovered a few streams of tiny (< 20 nm), high-velocity dust particles. A detailed analysis of the impact signals revealed that the registered particles were expelled from within the Saturnian system at speeds exceeding 100 km s-1. Such impact velocities can only be explained if the particles were released from the outskirts of Saturn's A ring. An interesting consequence of this result is that material from the dense inner rings can be analysed by in-situ dust detectors like the CDA. Until the end of August 2004, the dust instrument obtained about 400 time-of-flight mass spectra of stream particles. There is clear indication that the bulk material of the stream particles has to be a silicate. This implies that Saturnian stream particles are rather the inclusions of ring material than the ice particles itself.

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