Detection of exospheric O2+ at Saturn's moon Dione

Details Detection of exospheric O2+ at Saturn's moon Dione Detection of exospheric O2+ at Saturn's moon Dione

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3903105t&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 3, CiteID L03105

Physics

Planetary Sciences: Solar System Objects: Saturn, Planetary Sciences: Solar System Objects: Saturnian Satellites

Scientific paper

During a close pass of Cassini through the plasma wake of Saturn's moon Dione on April 7, 2010 the Cassini Plasma Spectrometer (CAPS) detected molecular oxygen ions (O2+) on pick up ring velocity distributions, thus providing the first in situ detection of a neutral exosphere surrounding the icy moon. The density of O2+ determined from the CAPS data ranges from 0.01 to 0.09 /cm3 and is used to estimate the exosphere O2 radial column density, obtaining the range 0.9 to 7 × 1011/cm2 . CAPS was unable to directly detect pick up H2O+ from the exosphere but the observations can be used to set an upper limit to their density of ∼10 times the O2+ density.

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