Jena 2013 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 7: Planeten-II
EP 7.3: Vortrag
Donnerstag, 28. Februar 2013, 11:45–12:00, HS 9
The influx of water ice particles to Titan's atmosphere determined by Cassini-CDA — •Ralf Srama1,2 and CDA Team1,2,3,4,5 — 1IRS, University Stuttgart, GER — 2MPI Kernphysik, Heidelberg, GER — 3Univ. Heidelberg, GER — 4Univ. Potsdam, GER — 5Univ. Oulu, FIN
The Cosmic Dust Analyser (CDA) onboard Cassini determines the speed, mass, charge and composition of individual dust particles in the environment of Saturn. Cassini is in orbit around Saturn since 2004 and the dust instrument was continuously measuring the particle properties in Saturn's largest ring, the E-ring. Due to the high reliability and sensitivity of CDA, it was discovered, that the E ring extents out to Titan's orbit. Therefore Titan acts as a sink for E-ring dust particles. This process deliveries water ice grains to Titan's atmosphere. In this paper we do estimate the overall influx of icy grains and the amount of water molecules provided by the E-ring. A comparison with Cassini-CIRS and new Herschel measurements is given.