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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 12
Ann. Geophys., 29, 2317–2326, 2011
https://doi.org/10.5194/angeo-29-2317-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Dynamical processes in space plasmas

Ann. Geophys., 29, 2317–2326, 2011
https://doi.org/10.5194/angeo-29-2317-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Dec 2011

23 Dec 2011

Relative ordering in the radial evolution of solar wind turbulence: the S-Theorem approach

G. Consolini1 and P. De Michelis2 G. Consolini and P. De Michelis
  • 1INAF – Istituto di Fisica dello Spazio Interplanetario, 00133 Roma, Italy
  • 2Istituto Nazionale di Geofisica e Vulcanologia, 00143 Roma, Italy

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 Alfvénic and non-Alfvénic 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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