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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Tsallis distributions of magnetic field strength variations in the heliosphere: 5 to 90 AU
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Tsallis distributions of magnetic field strength variations in the heliosphere: 5 to 90 AU

机译：Tsallis磁场强度的分布日球层的变化:5 - 90天文单位

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摘要

The Tsallis (q-exponential) distribution function, derived from the entropy principle of nonextensive statistical mechanics, describes fluctuations in the magnetic field strength on many scales throughout the heliosphere. This paper shows that a one-dimensional multifluid magnetohydrodynamic (MHD) model, with Advanced Composition Explorer (ACE) observations at 1 AU as input, predicts Tsallis distributions between 5 and 90 AU on scales from 1 to 128 days. At a scale of 1 day, the radial variation of the entropic index q decreases from q ≥ 5/3 at R ≤ 50 AU to q ≤ 5/3 at R ≥ 60 AU, corresponding to a change from a divergent to a convergent second moment of the Tsallis distribution, suggesting the possibility of a “phase transition” and/or a relaxation effect at ≈60 AU. The Tsallis distribution derived from the time series of one-dimensional MHD model is nearly identical to those observed by Voyager 1 at ～80 AU over the scales from 1 to 64 days during the year 2000. The Tsallis distribution appears over a wide range of scales and distances despite the complex nonlinear dynamical evolution of the heliospheric magnetic field during 1999/2000.
机译：Tsallis (q-exponential)分布函数,来自的熵原理nonextensive统计力学描述波动的磁场强度很多在日球层鳞片。论文表明,一维multifluid磁流体动力(磁流体动力)模型,先进作文Explorer (ACE)观察1 AU作为输入,预测Tsallis分布之间5和90名非盟尺度从1到128天。1天的规模,径向的变化熵的指数从q q减少≥5/3在R≤50非盟q≤5/3在R≥60盟,对应于一个改变从发散收敛时刻Tsallis分布,暗示的可能性和/或“相变”松弛效应在≈60盟。分布的时间序列中提取出来的一维磁流体动力模型几乎是相同的所观察到的旅行者1号~ 80 AU范围从1到2000年期间64天。Tsallis分布广泛出现范围的尺度和距离尽管复杂非线性动力学演化的日球磁场在1999/2000。

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