Journal Article

Impact of measurement uncertainties on universal scaling of MHD turbulence

G. Gogoberidze, S. C. Chapman, B. Hnat and M. W. Dunlop

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 2, pages 951-955
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI:
Impact of measurement uncertainties on universal scaling of MHD turbulence

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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.

Keywords: turbulence; Solar wind

Journal Article.  3696 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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