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| Titel |
Magnetic Field Fluctuations in Saturn's Magnetosphere |
| VerfasserIn |
Michael von Papen, Joachim Saur, Olga Alexandrova |
| 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 |
250076759
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| Zusammenfassung |
| In the framework of turbulence, we analyze the statistical properties of magnetic field
fluctuations measured by the Cassini spacecraft inside Saturn’s plasma sheet. In the
spacecraft-frame power spectra of the fluctuations we identify two power-law spectral ranges
seperated by a spectral break around ion gyro-frequencies of O+ and H+. The spectral
indices of the low frequency power-law are found to be between 5-3 (for fully
developed cascades) and 1 (during energy input on the corresponding scales). Above the
spectral break there is a constant power-law with mean spectral index ~2.5 indicating
a permament turbulent cascade in the kinetic range. An increasing non-gaussian
probability density with frequency indicates the build-up of intermittency. Correlations of
plasma parameters with the spectral indices are examined and it is found that the
power-law slope depends on background magnetic field strength and plasma beta. |
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