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1 IKI - Space Research Institute of the Russian Academy of Sciences 2 MPAe - Max-Planck-Institut für Aeronomie 3 Interplanetary Space Phys. Inst. 4 TUB - Technische Universität Berlin Berlin 5 Space Res. Center 6 Kyushu University Fukuoka 7 Charles University Prague 8 UiO - University of Oslo 9 LPCE - Laboratoire de physique et chimie de l-environnement 10 CESR - Centre d-étude spatiale des rayonnements 11 UMass Amherst - University of Massachusetts Amherst

Abstract : 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.





Autor: S. Savin - J. Büchner - G. Consolini - B. Nikutowski - L. Zelenyi - E. Amata - H. U. Auster - J. Blecki - E. Dubinin - K. H. For

Fuente: https://hal.archives-ouvertes.fr/



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