Cassini Dust Measurements at Enceladus and Implications for the Origin of the E Ring

Author:

Spahn Frank12345,Schmidt Jürgen12345,Albers Nicole12345,Hörning Marcel12345,Makuch Martin12345,Seiß Martin12345,Kempf Sascha12345,Srama Ralf12345,Dikarev Valeri12345,Helfert Stefan12345,Moragas-Klostermeyer Georg12345,Krivov Alexander V.12345,Sremčević Miodrag12345,Tuzzolino Anthony J.12345,Economou Thanasis12345,Grün Eberhard12345

Affiliation:

1. Institut für Physik, Universität Potsdam, Am Neuen Palais 10, Haus 19, D-14469 Potsdam, Germany.

2. Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.

3. Astrophysikalisches Institut, Friedrich Schiller Universität, 07745 Jena, Germany.

4. Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, HI 96822, USA.

5. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA.

Abstract

During Cassini's close flyby of Enceladus on 14 July 2005, the High Rate Detector of the Cosmic Dust Analyzer registered micron-sized dust particles enveloping this satellite. The dust impact rate peaked about 1 minute before the closest approach of the spacecraft to the moon. This asymmetric signature is consistent with a locally enhanced dust production in the south polar region of Enceladus. Other Cassini experiments revealed evidence for geophysical activities near Enceladus' south pole: a high surface temperature and a release of water gas. Production or release of dust particles related to these processes may provide the dominant source of Saturn's E ring.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference27 articles.

1. Observations of Saturn's Ring-Plane Crossings in August and November 1995

2. Structure and particle properties of Saturn's E Ring

3. The Cassini Cosmic Dust Analyzer

4. This property of the HRD becomes crucial in regions of high particle density (parts of the E ring and in the vicinity of its source satellites) where the impact ionization detector of the CDA is saturated.

5. Cassini Ion and Neutral Mass Spectrometer: Enceladus Plume Composition and Structure

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