A test-particle model of the atmosphere/ionosphere system of Saturn's main rings

Details A test-particle model of the atmosphere/ionosphere system of Saturn's main rings A test-particle model of the atmosphere/ionosphere system of Saturn's main rings

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3305106b&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 5, CiteID L05106

Physics

Plasma Physics

7

Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Planetary Sciences: Fluid Planets: Tori And Exospheres, Planetary Sciences: Solar System Objects: Planetary Rings, Space Plasma Physics: Ionization Processes (2423), Space Plasma Physics: Transport Processes

Scientific paper

The first pass of the Cassini orbiter near the A and B rings of Saturn, formed mainly by H2O ice particles, revealed the presence of an ionosphere composed of O+ and O2+ ions. Such a result suggests the existence of an atmospheric halo made up of molecular oxygen surrounding the rings. It is produced by solar UV radiation-induced decomposition of ice releasing molecular oxygen which does not stick on the surface at the relevant temperatures. A Monte Carlo model of the atmosphere/ionosphere ring system that uses test-particles and incorporates chemical processes and transport of both neutrals and plasma ions is developed. Published ion data from the ion mass spectrometer (IMS) experiment were used as constraint and the model provides a very satisfactory fit between simulated O+ and O2+ ion densities and those measured along Cassini trajectory.

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