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| Titel |
On the properties of turbulent boundary layer over polar cusps |
| VerfasserIn |
S. Savin, J. Büchner, G. Consolini, B. Nikutowski, L. Zelenyi, E. Amata, H. U. Auster, J. Blecki, E. Dubinin, K. H. Fornacon, H. Kawano, S. Klimov, F. Marcucci, Z. Nemecek, A. Pedersen, J. L. Rauch, S. Romanov, J. Safrankova, J. A. Sauvaud, A. Skalsky, P. Song, Yu. Yermolaev |
| 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 ; 9, no. 5/6 ; Nr. 9, no. 5/6, S.443-451 |
| Datensatznummer |
250006559
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| Publikation (Nr.) |
 copernicus.org/npg-9-443-2002.pdf |
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| Zusammenfassung |
| We study properties
of nonlinear magnetic fluctuations in the turbulent boundary layer (TBL)
over polar cusps during a typical TBL crossing on 19 June 1998.
Interball-1data in the summer TBL are compared with that of Geotail in
solar wind (SW) and Polar in the northern TBL. In the TBL two
characteristic slopes are seen: ~ - 1 at (0.004- 0.08) Hz and ~
- 2.2 at (0.08-2) Hz. We present evidences that random current sheets
with features of coherent solitons can result in: (i) slopes of ~
- 1 in the magnetic power spectra; (ii)
demagnetization of the SW plasma in "diamagnetic bubbles"; (iii)
nonlinear, presumably, 3-wave phase coupling with cascade features; (iiii)
departure from the Gaussian statistics. We discuss the above TBL
properties in terms of intermittency and self-organization of nonlinear
systems, and compare them with kinetic simulations of reconnected current
sheet at the nonlinear state. Virtual satellite data in the model current
sheet reproduce valuable cascade-like spectral and bi-spectral properties
of the TBL turbulence. |
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