Intermittency in Hall-magnetohydrodynamics with a strong guide field

Intermittency in Hall-magnetohydrodynamics with a strong guide field
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具有强引导场的霍尔磁流体动力学间歇性

DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
P. Mininni
P. Mininni
中科院分区:
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文献类型:
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作者:
P. R. Imazio;L. Martin;P. Dmitruk;P. Mininni

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本文详细研究了外加引导场的可压缩霍尔磁流体湍流的速度和磁场涨落的间歇性。为了数值求解该方程,采用了一种简化的模型,该模型在强引导场存在的情况下有效。在模拟中考虑了不同的离子皮肤深度值。对得到的数据进行分析,计算场增量在垂直于引导场的几个方向上,并建立结构函数和概率密度函数。在磁流体力学极限下,我们恢复了通常的结果,即磁场比速度场更具间歇性。在霍尔效应的存在下,在小于离子皮肤深度的尺度上的场起伏显示出间歇性水平的显著降低,接近于单峰尺度。
We present a detailed study of intermittency in the velocity and magnetic field fluctuations of compressible Hall-magnetohydrodynamic turbulence with an external guide field. To solve the equations numerically, a reduced model valid when a strong guide field is present is used. Different values for the ion skin depth are considered in the simulations. The resulting data are analyzed computing field increments in several directions perpendicular to the guide field, and building structure functions and probability density functions. In the magnetohydrodynamic limit, we recover the usual results with the magnetic field being more intermittent than the velocity field. In the presence of the Hall effect, field fluctuations at scales smaller than the ion skin depth show a substantial decrease in the level of intermittency, with close to monofractal scaling.
DOI: 10.1088/0004-637x/730/2/114
发表时间: 2011-04-01
影响因子: 4.9
作者:
Camporeale, Enrico;Burgess, David
通讯作者: Burgess, David
强磁场中的可压缩霍尔磁流体动力学
DOI: 10.1063/1.3159862
发表时间: 2009
期刊: Physics of Plasmas
影响因子: 2.2
作者:
Bian N
通讯作者: Bian N