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| Titel |
Structure functions and intermittency in ionospheric plasma turbulence |
| VerfasserIn |
L. Dyrud, B. Krane, M. Oppenheim, H. L. Pécseli, J. Trulsen, A. W. Wernik |
| 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 ; 15, no. 6 ; Nr. 15, no. 6 (2008-11-10), S.847-862 |
| Datensatznummer |
250012802
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| Publikation (Nr.) |
 copernicus.org/npg-15-847-2008.pdf |
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| Zusammenfassung |
| Low frequency electrostatic turbulence in the ionospheric E-region is
studied by means of numerical and experimental methods. We use the structure
functions of the electrostatic potential as a diagnostics of the
fluctuations. We demonstrate the inherently intermittent nature of the low
level turbulence in the collisional ionospheric plasma by using results for
the space-time varying electrostatic potential from two dimensional numerical
simulations. An instrumented rocket can not directly detect the one-point
potential variation, and most measurements rely on records of potential
differences between two probes. With reference to the space observations we
demonstrate that the results obtained by potential difference measurements
can differ significantly from the one-point results. It was found, in
particular, that the intermittency signatures become much weaker, when
the proper rocket-probe configuration is implemented. We analyze also
signals from an actual ionospheric rocket experiment, and find a reasonably
good agreement with the appropriate simulation results, demonstrating again
that rocket data, obtained as those analyzed here, are unlikely to give an
adequate representation of intermittent features of the low frequency
ionospheric plasma turbulence for the given conditions. |
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