On the properties of turbulent boundary layer over polar cusps

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. SkalskyP. Song, Yu Yermolaev

研究成果: Contribution to journalArticle査読

29 被引用数 (Scopus)

抄録

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-1 data 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.

本文言語英語
ページ(範囲)443-451
ページ数9
ジャーナルNonlinear Processes in Geophysics
9
5-6
DOI
出版ステータス出版済み - 2002

All Science Journal Classification (ASJC) codes

  • 統計物理学および非線形物理学
  • 地球物理学
  • 地球化学および岩石学

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