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| Titel |
Turbulent Magnetic Field Fluctuations in the Kronian Magnetosphere |
| VerfasserIn |
M. von Papen, J. Saur, O. Alexandrova |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069081
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| Zusammenfassung |
| We analyze statistical properties of magnetic field fluctuations in the magnetosphere of
Saturn within the framework of wave turbulence. For that purpose we investigate
magnetic field fluctuations with amplitudes δB-B0 < 0.1. These fluctuations are
analyzed in the local mean magnetic field frame at radial distances of 6.5-15 Saturn
radii measured during the first five orbits of the Cassini spacecraft. In the power
spectra of these fluctuations, ranging from 8 -
10-4 Hz to 3.5 Hz, we identify a
spectral break around 0.05 Hz followed by a power-law spectral range up to 1 Hz. We
calculate mean spectral indices for both parallel and perpendicular components of the
magnetic field fluctuations and show that the spectral indices of the low frequency
range before the spectral break are broadly distributed. In contrast, the spectral
indices of the high frequency range exhibit a much narrower distribution with mean
values of ~2.5 for both parallel and perpendicular spectra. Further we investigate the
statistic moments of third and fourth order of the increment time series, which
show considerable deviations from a gaussian distribution indicating intermittency. |
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