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| Titel |
Saturn Observations of Z-mode Wave Intensity and Possible Electron Acceleration |
| VerfasserIn |
Douglas Menietti, Shengyi Ye, Terrance Averkamp, Richard Horne, Yuri Shprits, Emma Woodfield, Donald Gurnett, Ann Persoon |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250104576
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| Publikation (Nr.) |
 EGU/EGU2015-4000.pdf |
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| Zusammenfassung |
| Past and recent studies have shown that chorus and z-mode/electron wave-particle
interactions can lead to electron acceleration in planetary magnetospheres. These electrons
may then form a partial source of planetary radiation belts. The wave acceleration process
depends on the local plasma density and on the distribution of wave intensity in frequency
and spatial coordinates. Following up on past chorus studies, in this work we identify
and bin the narrowband z-mode wave intensity observed by the Cassini radio and
plasma wave science (RPWS) investigation in the low density region r < ~ 7Rs near
the inner edge of the Enceladus plasma torus, where the condition fp/fc < 1
can be met (fp = plasma freq., fc = cyclotron freq.). The spatial bins include radial
distance, latitude, and local time. Within each spatial bin we calculate the mean
intensity-versus-frequency profile relative to 5kHz, which can then be analytically fit. One
goal of the investigation is to provide a database for use in quasilinear models requiring the
calculation of pitch angle and momentum diffusion coefficients. In this report we
present our initial findings, where significant z-mode emission is found near Saturn. |
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