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题名: Multiscale Pressure-Balanced Structures in Three-dimensional Magnetohydrodynamic Turbulence
作者: Yang, Liping; He, Jiansen; Tu, Chuanyi; Li, Shengtai; Zhang, Lei; Marsch, Eckart; Wang, Linghua; Wang, Xin; Feng, Xueshang
作者部门: 空间科学部
关键词: solar wind ; turbulence ; waves
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2017
卷号: 836, 期号:1, 页码:69
收录类别: SCI
项目资助者: NSFC [41304133, 41231069, 41574168, 41204105, 41274132, 41474147, 41421003] ; Specialized Research Fund for State Key Laboratories
英文摘要: Observations of solar wind turbulence indicate the existence of multiscale pressure-balanced structures (PBSs) in the solar wind. In this work, we conduct a numerical simulation to investigate multiscale PBSs and in particular their formation in compressive magnetohydrodynamic turbulence. By the use of the higher-order Godunov code Athena, a driven compressible turbulence with an imposed uniform guide field is simulated. The simulation results show that both the magnetic pressure and the thermal pressure exhibit a turbulent spectrum with a Kolmogorovlike power law, and that in many regions of the simulation domain they are anticorrelated. The computed wavelet cross-coherence spectra of the magnetic pressure and the thermal pressure, as well as their space series, indicate the existence of multiscale PBSs, with the small PBSs being embedded in the large ones. These multiscale PBSs are likely to be related to the highly oblique-propagating slow-mode waves, as the traced multiscale PBS is found to be traveling in a certain direction at a speed consistent with that predicted theoretically for a slow-mode wave propagating in the same direction.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5816
Appears in Collections:空间科学部_期刊论文

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