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Three-dimensional spatial structures of solar wind turbulence from 10 000-km to 100-km scales

Narita, Y. and Glassmeier, K.H. and Goldstein, M.L. and Motschmann, U. and Sahraoui, F. (2011) Three-dimensional spatial structures of solar wind turbulence from 10 000-km to 100-km scales. Annales Geophysicae, 29, pp. 1731-1738. DOI: 10.5194/angeo-29-1731-2011.

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Using the four Cluster spacecraft, we have determined the three-dimensional wave-vector spectra of fluctuating magnetic fields in the solar wind. Three different solar wind intervals of Cluster data are investigated for this purpose, representing three different spatial scales: 10 000 km, 1000 km, and 100 km. The spectra are determined using the wave telescope technique (k-filtering technique) without assuming the validity of Taylor�s frozen-in-flow hypothesis nor are any assumptions made as to the symmetry properties of the fluctuations. We find that the spectra are anisotropic on all the three scales and the power is extended primarily in the directions perpendicular to the mean magnetic field, as might be expected of two-dimensional turbulence, however, the analyzed fluctuations are not axisymmetric. The lack of axisymmetry invalidates some earlier techniques using single spacecraft observations that were used to estimate the percentage of magnetic energy residing in quasitwo- dimensional power. However, the dominance of twodimensional turbulence is consistent with the relatively long mean free paths of cosmic rays in observed in the heliosphere. On the other hand, the spectra also exhibit secondary extended structures oblique from the mean magnetic field direction. We discuss possible origins of anisotropy and asymmetry of solar wind turbulence spectra.

Document Type:Article
Title:Three-dimensional spatial structures of solar wind turbulence from 10 000-km to 100-km scales
AuthorsInstitution or Email of Authors
Narita, Y.Institut für Geophysik und Meteorologie, TU Braunschweig, Germany
Glassmeier, K.H.Institut für Geophysik und Meteorologie, TU Braunschweig, Germany
Goldstein, M.L.Geospace Physics Laboratory, Code 673, Goddard Space Flight Center, Greenbelt, MD 20771, USA
Motschmann, U.uwe.motschmann@dlr.de
Sahraoui, F.Laboratoire de Physique des Plasmas Observatoire de Saint-Maur, 4 avenue de Neptune, 94107 Saint-Maur-Des-Foss´es,
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1731-1738
Keywords:Interplanetary physics (Interplanetary magnetic fields; MHD waves and turbulence; Plasma waves and turbulence)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Planetenforschung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Susanne Pieth
Deposited On:10 Jan 2012 10:02
Last Modified:12 Dec 2013 21:31

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