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Authors: Consolini, G.* 
De Michelis, P.* 
Title: Relative ordering in the radial evolution of solar wind turbulence: the S-Theorem approach
Issue Date: 23-Dec-2011
Series/Report no.: special issue/29 (2011)
DOI: 10.5194/angeo-29-2317-2011
Keywords: Interplanetary physics (Solar wind plasma)
Space plasma physics (Turbulence)
Subject Classification01. Atmosphere::01.03. Magnetosphere::01.03.05. Solar variability and solar wind 
05. General::05.01. Computational geophysics::05.01.04. Statistical analysis 
Abstract: Over the past few decades scientists have shown growing interest in space plasma complexity and in understanding the turbulence in magnetospheric and interplanetary media. At the beginning of the 1980s, Yu. L. Klimontovich introduced a criterion, named S-Theorem, to evaluate the degree of order in far-from-equilibrium open systems, which applied to hydrodynamic turbulence showed that turbulence flows were more organized than laminar ones. Using the same theorem we have evaluated the variation of the degree of self-organization in both Alfv´enic and non-Alfv´enic turbulent fluctuations with the radial evolution during a long time interval characterized by a slow solar wind. This analysis seems to show that the radial evolution of turbulent fluctuations is accompanied by a decrease in the degree of order, suggesting that, in the case of slow solar wind, the turbulence decays with radial distance.
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