Global scale- free behaviour in compressive fluctuations in the fast solar wind, and pseudo- dynamic alignment

Details Global scale- free behaviour in compressive fluctuations in the fast solar wind, and pseudo- dynamic alignment Global scale- free behaviour in compressive fluctuations in the fast solar wind, and pseudo- dynamic alignment

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43c1977h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH43C-1977

Physics

Plasma Physics

[7863] Space Plasma Physics / Turbulence

Scientific paper

We present the first scale-by-scale quantitative comparison of the higher order statistics of magnetic field magnitude and component temporal fluctuations in the fast quiet solar wind. The magnetic field magnitude fluctuations show a single global intermittent non-Gaussian scale free behaviour from minutes to over 5 hours. This coexists with the signature in the field components of an inertial range of magnetohydrodynamic (MHD) turbulence up to ~ 30 minutes and a ~ 1/f range of coronal origin on longer timescales. This is found both in the ecliptic with ACE and in ULLYSES polar passes. This suggests a single stochastic process for magnetic field magnitude fluctuations operating across the full range of MHD timescales supported by the solar wind. Fluctuations in velocity and magnetic field show the strongest 'dynamic' alignment on scales in the ~ 1/f range. We wil discuss how uncertainties in velocity and magnetic field measurements propagate through 'compound' measures of the turbulence properties of the flow in this context. Observational evidence of incompressible MHD turbulence in the solar wind must thus be understood in the context of this global scaling of the compressive 'texture' of the solar wind.

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