MHD turbulence in the solar wind: self-similarity, intermittency and coherent structures.

Details MHD turbulence in the solar wind: self-similarity, intermittency and coherent structures. MHD turbulence in the solar wind: self-similarity, intermittency and coherent structures.

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ppcf...41..787v&link_type=abstract

Plasma Phys. Controlled Fusion, Vol. 41, p. A787 - A795

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21

Solar Wind: Magnetohydrodynamics, Solar Wind: Turbulence

Scientific paper

High-resolution numerical simulations on the one hand and solar wind data analysis on the other hand have allowed for much progress in our understanding of magnetohydrodynamic (MHD) turbulence. In this paper the author gives a schematic view of the main properties of solar wind MHD turbulence and discusses some results obtained from the analysis of velocity and magnetic field data measured during the space experiments of Helios and ISEE. In particular, he shows that applying the Haar wavelets technique to about one year of data taken every minute during the ISEE space experiment, it is possible to calculate spectra and structure functions of the turbulence; moreover the definition of a conditioned structure function allows: (a) the elimination of intermittency effects in spectra and thus for a clear identification of which kind of phenomenology of nonlinear cascade between Kolmogorov (1941) and Kraichnan (1974) is taking place in solar wind turbulence; (b) the identification of the most intermittent structures which turn out to be either shock waves or one-dimensional current sheets, at variance with ordinary fluid intermittency, where the most intermittent structures are found to be two-dimensional vortices.

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