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Nonlinear Processes in Geophysics 9, 5/6 (2002) 443-451

On the properties of turbulent boundary layer over polar cusps

S. Savin 1, J. Büchner 2, G. Consolini 3, B. Nikutowski 2, L. Zelenyi 1, E. Amata 3, H. U. Auster 4, J. Blecki 5, E. Dubinin 2, K. H. Fornacon 4, H. Kawano 6, S. Klimov 1, F. Marcucci 3, Z. Nemecek 7, A. Pedersen 8, J. L. Rauch 9, S. Romanov 1, J. Safrankova 7, J. A. Sauvaud 10, A. Skalsky 1, P. Song 11, Yu. Yermolaev 1

(2002)

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.

1:	Space Research Institute
	Russian Academy of Sciences
2:	Max-Planck-Institut für Aeronomie
	Max-Planck-Institut für Aeronomie
3:	Interplanetary Space Phys. Inst.
	Interplanetary Space Phys. Inst.
4:	Technische Universität Berlin (TUB)
	Technische Universität Berlin
5:	Space Res. Center
	Space Res. Center
6:	Kyushu University
	Kyushu University
7:	Charles University
	Charles University
8:	University of Oslo (UiO)
	University of Oslo
9:	Laboratoire de physique et chimie de l'environnement (LPCE)
	CNRS : UMR6115 – INSU – Université d'Orléans
10:	Centre d'étude spatiale des rayonnements (CESR)
	CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III
11:	University of Massachusetts at Lowell
	University of Massachusetts at Lowell

Subject

:

Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics Sciences of the Universe/Astrophysics Sciences of the Universe/Earth Sciences

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Submitted on: Tuesday, 1 January 2002 08:00:00

Updated on: Wednesday, 15 October 2008 13:37:16