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| Titel |
Investigating turbulent structure of ionospheric plasma velocity using the Halley SuperDARN radar |
| VerfasserIn |
G. A. Abel, M. P. Freeman, G. Chisham, N. W. Watkins |
| 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 ; 14, no. 6 ; Nr. 14, no. 6 (2007-12-07), S.799-809 |
| Datensatznummer |
250012315
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| Publikation (Nr.) |
 copernicus.org/npg-14-799-2007.pdf |
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| Zusammenfassung |
| We present a detailed analysis of the spatial structure of the ionospheric plasma
velocity in the nightside F-region ionosphere, poleward of the open-closed magnetic
field line boundary (OCB), i.e. in regions magnetically connected to the turbulent
solar wind. We make use of spatially distributed measurements of the ionospheric plasma
velocity made with the Halley Super Dual Auroral Radar Network (SuperDARN) radar between
1996 and 2003. We analyze the spatial structure of the plasma velocity using structure functions
and P(0) scaling (where P(0) is the value of the probability density function at 0), which
provide simple methods for deriving information about the scaling, intermittency and multi-fractal
nature of the fluctuations. The structure functions can also be compared to values predicted by different
turbulence models. We find that the limited range of velocity that can be measured by the Halley SuperDARN
radar restricts our ability to calculate structure functions. We correct for this by using conditioning
(removing velocity fluctuations with magnitudes larger than 3 standard deviations from our calculations).
The resultant structure functions suggest that Kraichnan-Iroshnikov versions of P and log-normal models of
turbulence best describe the velocity structure seen in the ionosphere. |
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