Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3520103m&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 20, CiteID L20103
Physics
10
Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Magnetosphere Interactions With Satellites And Rings, Planetary Sciences: Solar System Objects: Saturnian Satellites, Magnetospheric Physics: Magnetosphere: Inner, Planetary Sciences: Fluid Planets: Tori And Exospheres
Scientific paper
We present an analysis of molecular oxygen ion (O2 +) abundance in Saturn's inner magnetosphere based on observations made with the Cassini Plasma Spectrometer (CAPS). Using data summed over 23 orbits, we resolve and isolate O2 + counts from the tail of the water group ion mass distribution (W+ [O+, OH+, H2O+, H3O+]) and from background sources. O2 + was initially estimated at ~1-2% of the total ion population in the inner magnetosphere based on CAPS data from the Saturn orbital insertion pass. Through refined analysis techniques, we have found O2 + to account for just above 0.3% of all W+ ions at L = 4.5, with only minor fluctuations in relative density out to L = 7.5 - 8.0. Beyond L = 7.5, the relative O2 +/W+ abundance exhibits a statistically significant increase through L = 10.5, which may indicate a neutral O2 source in the vicinity of Rhea.
Johnson Robert E.
Martens Hilary R.
Reisenfeld Daniel Brett
Smith Howard T.
Williams John D.
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