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| Titel |
Four-dimensional energy spectrum for space–time structure of plasma turbulence |
| VerfasserIn |
Y. Narita |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 21, no. 1 ; Nr. 21, no. 1 (2014-01-09), S.41-47 |
| Datensatznummer |
250120873
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| Publikation (Nr.) |
 copernicus.org/npg-21-41-2014.pdf |
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| Zusammenfassung |
| A parametric model of the inertial-range energy spectrum is constructed for
plasma turbulence in the four-dimensional wave vector and frequency domain.
The model is based on that of the Eulerian wavenumber-frequency spectrum
developed for describing fluid turbulence, and includes wave vector
anisotropies in the three-dimensional wave vector domain by approximating the
spectrum to a set of ellipses. The shape of the four-dimensional spectrum is
determined by the Doppler shift, the Doppler broadening, and anisotropy
coefficients. The model is applied to the magnetic energy spectrum in the
near-Earth solar wind measured by four Cluster spacecraft, and the set of the
spectral parameters are determined observationally. In this way, space–time
structure of plasma turbulence can be condensed into a small number of
parameters, which is suitable for evaluating the energy spectra in
observational and numerical studies on the quantitative basis. |
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