Plasma Composition Near Enceladus

Details Plasma Composition Near Enceladus Plasma Composition Near Enceladus

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p52a..03g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P52A-03

Other

5704 Atmospheres (0343, 1060), 5737 Magnetospheres (2756), 6020 Ices, 6280 Saturnian Satellites

Scientific paper

During the first year of its orbital tour of Saturn the Cassini spacecraft has performed two close flybys of the icy satellite Enceladus: on March 9, 2005 (504 km closest approach altitude at 6.6 km/s) and July 14, 2005 (172 km altitude at 8.2 km/s). The Cassini Plasma Spectrometer (CAPS) on board the spacecraft measured plasma ion composition (among other things) in the vicinity of Enceladus during these flybys. The primary constituents observed are the so-called water group ions, presumably the result of various electron impact, ion-molecule and solar UV induced reactions with water vapor evolved from icy surfaces. We also identify O2+, C+, and N+. We will discuss some of the probable chemical processes involved and hazard some thoughts about the source of the water vapor. We will also discuss how this watery environment is more dissimilar than similar to a cometary coma.

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