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www.nonlin-processes-geophys.net/9/443/2002/
doi:10.5194/npg-9-443-2002
© Author(s) 2002. This work is licensed
under a Creative Commons License.
On the properties of turbulent boundary layer over polar cusps
1Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, Moscow, 117810, Russia
2Interplanetary Space Phys. Inst., CNR, Roma, Italy
3Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany
4Space Res. Center, Polish Academy Sci., Warsaw, Poland
5Laboratory Phys. and Chemistry Environment, Orleans, France
6University of Massachusetts at Lowell, Lowell, MA, USA
7CESR, Toulouse, France
8Charles University, Prague, Czech Republic
9University of Oslo, Norway
10Kyushu University, Japan
11Technical University, Braunschweig, Germany
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.
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Citation: Savin, S., Büchner, J., Consolini, G., Nikutowski, B., Zelenyi, L., Amata, E., Auster, H. U., Blecki, J., Dubinin, E., Fornacon, K. H., Kawano, H., Klimov, S., Marcucci, F., Nemecek, Z., Pedersen, A., Rauch, J. L., Romanov, S., Safrankova, J., Sauvaud, J. A., Skalsky, A., Song, P., and Yermolaev, Yu.: On the properties of turbulent boundary layer over polar cusps, Nonlin. Processes Geophys., 9, 443-451, doi:10.5194/npg-9-443-2002, 2002. Bibtex EndNote Reference Manager XML
