Cassini detection of Enceladus' cold water-group plume ionosphere

Details Cassini detection of Enceladus' cold water-group plume ionosphere Cassini detection of Enceladus' cold water-group plume ionosphere

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3613203t&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 13, CiteID L13203

Physics

16

Planetary Sciences: Solar System Objects: Saturnian Satellites, Planetary Sciences: Solar System Objects: Saturn, Planetary Sciences: Fluid Planets: Magnetospheres (2756)

Scientific paper

This study reports direct detection by the Cassini plasma spectrometer of freshly-produced water-group ions (O+, OH+, H2O+, H3O+) and heavier water dimer ions (HxO2)+ very close to Enceladus where the plasma begins to emerge from the plume. The data were obtained during two close (52 and 25 km) flybys of Enceladus in 2008 and are similar to ion data in cometary comas. The ions are observed in detectors looking in the Cassini ram direction exhibiting energies consistent with the Cassini speed, indicative of a nearly stagnant plasma flow in the plume. North of Enceladus the plasma slowing commences about 4 to 6 Enceladus radii away, while south of Enceladus signatures of the plasma interaction with the plume are detected 22 Enceladus radii away.

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