Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1608p&link_type=abstract
American Astronomical Society, DPS meeting #42, #16.08; Bulletin of the American Astronomical Society, Vol. 42, p.977
Astronomy and Astrophysics
Astronomy
Scientific paper
Data obtained by the Cassini spacecraft during recent close flybys of Enceladus will be presented. Prior compositional measurements of E ring grains with Cassini's Cosmic Dust Analyser (CDA) suggested salt-rich water as the dominant source of Enceladus' plume. Although the E ring dust population is dominated by ice particles stemming from Enceladus it was unclear how representative the E ring particles were of the original plume grain ensemble. During 2008 and 2009 Cassini passed deep into the plumes on several occasions, allowing the CDA team to analyse the compositions of freshly ejected plume particles for the first time. From this information a compositional profile of the plume has been inferred, showing that close to Enceladus' surface its composition differs significantly from that of the E ring. The observations can only be reproduced with a dominant liquid water plume source.
Hillier John Kenneth
Kempf Sascha
Postberg Frank
Schmidt Jonas
Srama Ralf
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