Universal probability distribution function for bursty transport in plasma turbulence.
Universal probability distribution function for bursty transport in plasma turbulence.
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DOI：
10.1103/physrevlett.103.165001
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发表时间：
2009-08
影响因子：
8.6
通讯作者：
I. Sandberg;S. Benkadda;X. Garbet;G. Ropokis;K. Hizanidis;D. del-Castillo-Negrete
中科院分区：
文献类型：
--
作者：
I. Sandberg;S. Benkadda;X. Garbet;G. Ropokis;K. Hizanidis;D. del-Castillo-Negrete
与对流运动相关的突发性输送现象在不同的物理系统中具有普遍的统计特征。本文提出了一个描述等离子体湍流中猝发输运的随机单变量模型和相应的概率分布函数。所提出的随机过程恢复了在几种磁约束装置的等离子体边缘观察到的密度起伏的普遍分布以及它们的偏度S和峰度K之间的显着标度。在以对流为特征的其他物理系统中也观察到了类似的变率统计特征，如天鹅座X-1吸积盘等离子体发射的X射线波动和海面温度波动。
Bursty transport phenomena associated with convective motion present universal statistical characteristics among different physical systems. In this Letter, a stochastic univariate model and the associated probability distribution function for the description of bursty transport in plasma turbulence is presented. The proposed stochastic process recovers the universal distribution of density fluctuations observed in plasma edge of several magnetic confinement devices and the remarkable scaling between their skewness S and kurtosis K. Similar statistical characteristics of variabilities have been also observed in other physical systems that are characterized by convection such as the x-ray fluctuations emitted by the Cygnus X-1 accretion disc plasmas and the sea surface temperature fluctuations.