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| Titel |
Dispersion relation analysis of turbulent magnetic field fluctuations in fast solar wind |
| VerfasserIn |
C. Perschke, Y. Narita, S. P. Gary, U. Motschmann, K.-H. Glassmeier |
| 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 ; 31, no. 11 ; Nr. 31, no. 11 (2013-11-15), S.1949-1955 |
| Datensatznummer |
250086143
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1949-2013.pdf |
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| Zusammenfassung |
| Physical processes of the energy transport in solar wind turbulence are a subject of intense studies, and different
ideas exist to explain them. This manuscript describes the investigation of dispersion properties in short-wavelength
magnetic turbulence during a rare high-speed solar wind event with a flow
velocity of about 700 km s−1 using magnetic field and ion data from the Cluster spacecraft. Using the multi-point
resonator technique, the dispersion relations (i.e., frequency versus wave-number values in the solar wind frame) of
turbulent magnetic fluctuations with wave numbers near the inverse ion inertial length are determined. Three major
results are shown: (1) the wave vectors are uniformly quasi-perpendicular to the mean magnetic field; (2) the
fluctuations show a broad range of frequencies at wavelengths around the ion inertial length; and (3) the direction of
propagation
at the observed wavelengths is predominantly in the sunward direction. These results suggest the
existence of high-frequency dispersion relations partly associated with normal modes on small scales.
Therefore nonlinear energy cascade processes seem to be acting that are not described by wave–wave interactions. |
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