Impact of observational uncertainties on universal scaling of MHD turbulence

Details Impact of observational uncertainties on universal scaling of MHD turbulence Impact of observational uncertainties on universal scaling of MHD turbulence

2011-10-31

arxiv.org/abs/1110.6804v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Scientific paper

Scaling exponents are the central quantitative prediction of theories of turbulence and in-situ satellite observations of the high Reynolds number solar wind flow have provided an extensive testbed of these. We propose a general, instrument independent method to estimate the uncertainty of velocity field fluctuations. We obtain the systematic shift that this uncertainty introduces into the observed spectral exponent. This shift is essential for the correct interpretation of observed scaling exponents. It is sufficient to explain the contradiction between spectral features of the Elsasser fields observed in the solar wind with both theoretical models and numerical simulations of Magnetohydrodynamic turbulence.

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