title: Wave-vector dependence of magnetic-turbulence spectra in the solar wind.
abstract: Using four-point measurements of the Cluster spacecraft, the energy distribution was determined for magnetic field fluctuations in the solar wind directly in the three-dimensional wave-vector domain in the range |k|<or=1.5x10{-3} rad/km. The energy distribution exhibits anisotropic features characterized by a prominently extended structure perpendicular to the mean field preferring the ecliptic north direction and also by a moderately extended structure parallel to the mean field. From the three-dimensional energy distribution wave vector anisotropy is estimated with respect to directions parallel and perpendicular to the mean magnetic field, and the result suggests the dominance of quasi-two-dimensional turbulence toward smaller spatial scales.
authors.affiliation: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany. y.narita@tu-bs.de
authors.forename: Y
authors.initials: Y
authors.lastname: Narita
authors.forename: K-H
authors.initials: KH
authors.lastname: Glassmeier
authors.forename: F
authors.initials: F
authors.lastname: Sahraoui
authors.forename: M L
authors.initials: ML
authors.lastname: Goldstein