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| Titel |
Analysis of plasma waves observed in the inner Saturn magnetosphere |
| VerfasserIn |
J. D. Menietti, O. Santolík, A. M. Rymer, G. B. Hospodarsky, D. A. Gurnett, A. J. Coates |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 9 ; Nr. 26, no. 9 (2008-09-09), S.2631-2644 |
| Datensatznummer |
250016214
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2631-2008.pdf |
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| Zusammenfassung |
| Plasma waves observed in the Saturn magnetosphere provide an indication of
the plasma population present in the rotationally dominated inner
magnetosphere. Electrostatic cyclotron emissions often with harmonics and
whistler mode emission are a common feature of Saturn's inner magnetosphere.
The electron observations for a region near 5 RS outside and near a
plasma injection region indicate a cooler low-energy (<100 eV), nearly
isotropic plasma, and a much warmer (E>1000 eV) more pancake or butterfly
distribution. We model the electron plasma distributions to conduct a linear
dispersion analysis of the wave modes. The results suggest that the
electrostatic electron cyclotron emissions can be generated by phase space
density gradients associated with a loss cone that may be up to 20°
wide. This loss cone is sometimes, but not always, observed because the
field of view of the electron detectors does not include the magnetic field
line at the time of the observations. The whistler mode emission can be
generated by the pancake-like distribution and temperature anisotropy
(T⊥/T||>1) of the warmer plasma population. |
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