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??nic and non-Alfv??nic 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.
展开▼
机译：在过去的几十年中，科学家对空间等离子体的复杂性以及对磁层和行星际介质中湍流的了解日益浓厚。 1980年代初，于。 L. Klimontovich引入了一个名为S-定理的准则，以评估远离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Alfv？nic和非Alfv？nic湍流波动中自组织程度的变化以及在以太阳风缓慢为特征的较长时间间隔内的径向演化。该分析似乎表明，湍流波动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，湍流随径向距离而衰减。
展开▼
