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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 8
Ann. Geophys., 27, 3019–3025, 2009
https://doi.org/10.5194/angeo-27-3019-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 3019–3025, 2009
https://doi.org/10.5194/angeo-27-3019-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 Aug 2009

04 Aug 2009

Multi-spacecraft measurement of anisotropic power levels and scaling in solar wind turbulence

K. T. Osman and T. S. Horbury K. T. Osman and T. S. Horbury
  • The Blackett Laboratory, Imperial College London, SW7 2AZ, UK

Abstract. Measurements by the four Cluster spacecraft in the solar wind are used to determine quantitatively the field-aligned anisotropy of magnetohydrodynamic inertial range turbulence power levels and spectral indexes. We find, using time-lagged second order structure functions, that the spectral index is near 2 around the field-parallel direction, which is consistent with a "critical balance" turbulent cascade. Solar wind fluctuations are found to be anisotropic with power mainly in wavevectors perpendicular to the mean field, where the spectral index is around 5/3.

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