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. Skalsky; P. Song; Yu Yermolaev

doi:10.5194/npg-9-443-2002

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

Earth Planetary Fluid and Space Sciences

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

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-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.

Original language	English
Pages (from-to)	443-451
Number of pages	9
Journal	Nonlinear Processes in Geophysics
Volume	9
Issue number	5-6
DOIs	https://doi.org/10.5194/npg-9-443-2002
Publication status	Published - 2002

All Science Journal Classification (ASJC) codes

Statistical and Nonlinear Physics
Geophysics
Geochemistry and Petrology

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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., ... Yermolaev, Y. (2002). On the properties of turbulent boundary layer over polar cusps. Nonlinear Processes in Geophysics, 9(5-6), 443-451. https://doi.org/10.5194/npg-9-443-2002

Savin, S, Büchner, J, Consolini, G, Nikutowski, B, Zelenyi, L, Amata, E, Auster, HU, Blecki, J, Dubinin, E, Fornacon, KH, Kawano, H, Klimov, S, Marcucci, F, Nemecek, Z, Pedersen, A, Rauch, JL, Romanov, S, Safrankova, J, Sauvaud, JA, Skalsky, A, Song, P & Yermolaev, Y 2002, 'On the properties of turbulent boundary layer over polar cusps', Nonlinear Processes in Geophysics, vol. 9, no. 5-6, pp. 443-451. https://doi.org/10.5194/npg-9-443-2002

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title = "On the properties of turbulent boundary layer over polar cusps",

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-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.",

author = "S. Savin and J. B{\"u}chner and G. Consolini and B. Nikutowski and L. Zelenyi and E. Amata and Auster, {H. U.} and J. Blecki and E. Dubinin and Fornacon, {K. H.} and H. Kawano and S. Klimov and F. Marcucci and Z. Nemecek and A. Pedersen and Rauch, {J. L.} and S. Romanov and J. Safrankova and Sauvaud, {J. A.} and A. Skalsky and P. Song and Yu Yermolaev",

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doi = "10.5194/npg-9-443-2002",

language = "English",

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pages = "443--451",

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T1 - On the properties of turbulent boundary layer over polar cusps

AU - Savin, S.

AU - Büchner, J.

AU - Consolini, G.

AU - Nikutowski, B.

AU - Zelenyi, L.

AU - Amata, E.

AU - Auster, H. U.

AU - Blecki, J.

AU - Dubinin, E.

AU - Fornacon, K. H.

AU - Kawano, H.

AU - Klimov, S.

AU - Marcucci, F.

AU - Nemecek, Z.

AU - Pedersen, A.

AU - Rauch, J. L.

AU - Romanov, S.

AU - Safrankova, J.

AU - Sauvaud, J. A.

AU - Skalsky, A.

AU - Song, P.

AU - Yermolaev, Yu

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

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JO - Nonlinear Processes in Geophysics

JF - Nonlinear Processes in Geophysics

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ER -

On the properties of turbulent boundary layer over polar cusps

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