期刊
ASTROPHYSICAL JOURNAL
卷 590, 期 2, 页码 858-873出版社
IOP Publishing Ltd
DOI: 10.1086/375021
关键词
methods : numerical; MHD; turbulence
We analyze the spectral properties of driven, supersonic, compressible, magnetohydrodynamic (MHD) turbulence obtained via high-resolution numerical experiments, for application to understanding the dynamics of giant molecular clouds. Via angle-averaged power spectra, we characterize the transfer of energy from the intermediate, driving scales down to smaller dissipative scales and also present evidence for inverse cascades that achieve modal equipartition levels on larger spatial scales. Investigating compressive versus shear modes separately, we evaluate their relative total power and find that as the magnetic field strength decreases, (1) the shear fraction of the total kinetic power decreases and (2) slopes of power-law fits over the inertial range steepen. To relate to previous work on incompressible MHD turbulence, we present qualitative and quantitative measures of the scale-dependent spectral anisotropy arising from the shear Alfven cascade and show how these vary with changing mean magnetic field strength. Finally, we propose a method for using anisotropy in velocity centroid maps as a diagnostic of the mean magnetic field strength in observed cloud cores.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据