Get access

Impact of measurement uncertainties on universal scaling of MHD turbulence

Authors

  • G. Gogoberidze,

    Corresponding author
    1. Institute of Theoretical Physics, Ilia State University, Tbilisi, Georgia
    • Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7AL
    Search for more papers by this author
  • S. C. Chapman,

    1. Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7AL
    Search for more papers by this author
  • B. Hnat,

    1. Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7AL
    Search for more papers by this author
  • M. W. Dunlop

    1. Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7AL
    2. Rutherford-Appleton Laboratory, Chilton, Oxfordshire OX11 0QX
    3. CSSAR, CAS, Beijing, China
    4. The Blackett Laboratory, Imperial College London, London, SW7 2AZ
    Search for more papers by this author

E-mail: grigol_gogoberidze@iliauni.edu.ge

ABSTRACT

Quantifying the scaling of fluctuations in the solar wind is central to testing predictions of turbulence theories. We study spectral features of Alfvénic turbulence in fast solar wind. We propose a general, instrument-independent method to estimate the uncertainty in velocity fluctuations obtained by in situ satellite observations in the solar wind. We show that when the measurement uncertainties of the velocity fluctuations are taken into account the less energetic Elsasser spectrum obeys a unique power law scaling throughout the inertial range as prevailing theories of magnetohydrodynamic (MHD) turbulence predict. Moreover, in the solar wind interval analysed, the two Elsasser spectra are observed to have the same scaling exponent γ = −1.54 throughout the inertial range.

Ancillary