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题名: Influence of Intermittency on the Quasi-perpendicular Scaling in Three-dimensional Magnetohydrodynamic Turbulence
作者: Yang, Liping; He, Jiansen; Tu, Chuanyi; Li, Shengtai; Zhang, Lei; Wang, Xin; Marsch, Eckart; Wang, Linghua
作者部门: 空间科学部
通讯作者: He, JS (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
关键词: magnetohydrodynamics (MHD) ; solar wind ; turbulence
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2017
卷号: 846, 期号:1
收录类别: SCI
项目资助者: NSFC [41474147, 41231069, 41222032, 41274132, 41574168, 41421003, 41231068] ; Specialized Research Fund for State Key Laboratories
英文摘要: Solar wind fluctuations reveal the ubiquity of intermittency, which is believed to affect the spectral signatures of turbulence. In this work, based on simulation of driven compressible MHD turbulence, we apply the wavelet technique to the magnetic field and velocity to identify intermittency, and we analyze the influence of the intermittency on the quasi-perpendicular scaling in the inertial range. The numerical results show that the original magnetic and velocity fluctuations are anisotropic, and have a power anisotropy with a spectral index approaching the Iroshnikov-Kraichnan -3/2 scaling in the direction quasi-perpendicular to the local mean magnetic field. As in observations of the solar wind fluctuations, as the scale decreases in the simulation, the calculated probability distribution functions (pdfs) of the wavelet coefficients become extended on both tails of the non-Gaussian distribution, with a rapid increase in flatness. After intermittency has been removed from the driven turbulence, at each scale, the pdfs approach a Gaussian distribution, with the flatness being similar to 3. Meanwhile, the quasi-perpendicular scaling for both fluctuations becomes steeper and close to a Kolmogorov -5/3 scaling, which may be a result of the stronger intermittency in the quasi-perpendicular direction and at the smaller scales. These results suggest that there is intermittency superposed on the "background" turbulence that seems to have the Kolmogorov scaling, whereby the overall slope is getting flatter with the involvement of intermittency.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6036
Appears in Collections:空间科学部_期刊论文

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