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| Titel |
Wavevector anisotropy of plasma turbulence at ion kinetic scales: solar wind observations and hybrid simulations |
| VerfasserIn |
H. Comişel, Y. Narita, U. Motschmann |
| 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. 6 ; Nr. 21, no. 6 (2014-11-11), S.1075-1083 |
| Datensatznummer |
250120949
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| Publikation (Nr.) |
 copernicus.org/npg-21-1075-2014.pdf |
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| Zusammenfassung |
| Wavevector anisotropy of ion-scale plasma turbulence is studied at various values of ion beta.
Two complementary methods are used. One is multi-point measurements
of magnetic field in the near-Earth solar wind as provided by the Cluster spacecraft mission,
and the other is hybrid numerical simulation of two-dimensional plasma turbulence.
Both methods demonstrate
that the wavevector anisotropy is reduced with increasing values of ion beta.
Furthermore, the numerical simulation study
shows the existence of a scaling law between ion beta and
the wavevector anisotropy of the fluctuating magnetic field
that is controlled by the thermal or hybrid particle-in-cell simulation noise.
Likewise, there is weak evidence that the power-law scaling
can be extended to the turbulent fluctuating cascade.
This fact can be used to construct a diagnostic tool to determine
or to constrain ion beta using multi-point magnetic field measurements in space. |
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