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          Institute: MPI für Kernphysik     Collection: Interplanetary Dust Physics     Display Documents

ID: 207125.0, MPI für Kernphysik / Interplanetary Dust Physics
High-velocity streams of dust originating from Saturn
Authors:Kempf, Sascha; Srama, Ralf; Horanyi, Mihaly; Burton, Marcia; Helfert, Stefan; Moragas-Klostermeyer, Georg; Roy, Mou; Grün, Eberhard
Date of Publication (YYYY-MM-DD):2005-01-20
Title of Journal:Nature
Issue / Number:7023
Start Page:289
End Page:291
Copyright:Nature Publishing Group
Review Status:not specified
Audience:Experts Only
Abstract / Description:High-velocity submicrometre-sized dust particles expelled from the jovian system have been identified by dust detectors on board several spacecraft. On the basis of periodicities in the dust impact rate, Jupiter's moon Io was found to be the dominant source of the streams. The grains become positively charged within the plasma environment of Jupiter's magnetosphere, and gain energy from its co-rotational electric field. Outside the magnetosphere, the dynamics of the grains are governed by the interaction with the interplanetary magnetic field that eventually forms the streams. A similar process was suggested for Saturn. Here we report the discovery by the Cassini spacecraft of bursts of high-velocity dust particles ( 100 km s-1) within approx70 million kilometres of Saturn. Most of the particles detected at large distances appear to originate from the outskirts of Saturn's outermost main ring. All bursts of dust impacts detected within 150 Saturn radii are characterized by impact directions markedly different from those measured between the bursts, and they clearly coincide with the spacecraft's traversals through streams of compressed solar wind.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group K. Mauersberger/Interplantary Dust Research (E. Grün)
External Affiliations:Laboratory for Atmospheric and Space Physics, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109, USA
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