Over the past few decades scientists have shown growing interest in spaceplasma complexity and in understanding the turbulence in magnetospheric andinterplanetary media. At the beginning of the 1980s, Yu. L. Klimontovichintroduced a criterion, named S-Theorem, to evaluate the degree of order infar-from-equilibrium open systems, which applied to hydrodynamic turbulenceshowed that turbulence flows were more organized than laminar ones. Using thesame theorem we have evaluated the variation of the degree ofself-organization in both Alfvénic and non-Alfvénic turbulentfluctuations with the radial evolution during a long time intervalcharacterized by a slow solar wind. This analysis seems to show that theradial evolution of turbulent fluctuations is accompanied by a decrease inthe degree of order, suggesting that, in the case of slow solar wind, theturbulence decays with radial distance.
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机译：在过去的几十年中，科学家对太空等离子体的复杂性以及对磁层和行星际介质中湍流的理解越来越引起人们的兴趣。 1980年代初，于。 L. Klimontovichin引入了一个名为S-定理的标准，以评估从平衡到平衡的开放系统的有序度，该系统应用于流体动力湍流，表明湍流比层流更有序。使用相同的定理，我们评估了在由太阳缓慢风表征的长时间间隔内，Alfvénic湍流和非Alfvénic湍流的自组织程度随径向演化的变化。该分析似乎表明，湍流涨落的径向演化伴随着有序度的降低，这表明在太阳风缓慢的情况下，湍流随着径向距离而衰减。
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