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| Titel |
The electro-static potential of E ring grains |
| VerfasserIn |
Sascha Kempf, Ralf Srama, Georg Moragas-Klostermeyer, Hsiang-Wen Hsu, Mihaly Horanyi, Nicolas Altobelli |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250083363
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| Zusammenfassung |
| Cassini's Cosmic Dust Analyser (CDA) has the unique ability to measure
in-situ the charge carried by dust grains in excess of about 1 micron. Using
the grain sizes measured simultaneously with the grain charge, also the
electrostatic potential of the grains can be determined. The potential of
E ring grains primarily stems from the charge transfer between the ambient
plasma and the dust and from the photoionisation due to the solar UV. in
the presence of many dust grains, the charge on grains can be significantly
reduces due to collective effects. Direct grain charge measurements offer
an unique means to asses the dust plasma interaction in Saturn's E ring.
During the last 3 years the CDA charge detector obtained sufficiently large
data sets during 5 spacecraft traversals of Saturn's shadow, where the grain
charging is only due to plasma collection currents. We will present the
dependence of the (shadow) potential on the distance to Saturn and will
discuss the implications of the CDA data for the nature of the dust plasma
interaction in Saturn's E ring. |
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