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      Anisotropic scaling of magnetohydrodynamic turbulence

      Horbury, Timothy S.; Forman, Miriam A.; Oughton, Sean
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      Anisotropic scaling of magnetohydrodynamic turbulence.pdf
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      DOI
       10.1103/PhysRevLett.101.175005
      Link
       link.aps.org
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      Horbury, T. S., Forman, M.A. & Oughton, S.(2008). Anisotropic scaling of magnetohydrodynamic turbulence. Physical Review Letters. 101, 175005.
      Permanent Research Commons link: https://hdl.handle.net/10289/2011
      Abstract
      We present a quantitative estimate of the anisotropic power and scaling of magnetic field fluctuations in inertial range magnetohydrodynamic turbulence, using a novel wavelet technique applied to spacecraft measurements in the solar wind. We show for the first time that, when the local magnetic field direction is parallel to the flow, the spacecraft-frame spectrum has a spectral index near 2. This can be interpreted as the signature of a population of fluctuations in field-parallel wavenumbers with a k║-2 spectrum but is also consistent with the presence of a "critical balance" style turbulent cascade. We also find, in common with previous studies, that most of the power is contained in wavevectors at large angles to the local magnetic field and that this component of the turbulence has a spectral index of 5/3.
      Date
      2008
      Type
      Journal Article
      Publisher
      American Physical Society
      Rights
      This is an author's version preprint of an article published in the journal Physical Review Letters. © American Physical Society.
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      • Computing and Mathematical Sciences Papers [1455]
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