New Regime of Magnetohydrodynamic Turbulence: Cascade below the Viscous Cutoff
New Regime of Magnetohydrodynamic Turbulence: Cascade below the Viscous Cutoff
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DOI：
10.1086/339453
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发表时间：
2001-12
期刊：
影响因子：
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通讯作者：
Jungyeon Cho;A. Lazarian;E. Vishniac
中科院分区：
文献类型：
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作者：
Jungyeon Cho;A. Lazarian;E. Vishniac
在天体物理学的情况下，例如，在星际介质（ISM）中，中性粒子可以在比磁扩散尺度大得多的尺度上提供粘性阻尼。通过数值模拟，我们发现在耗散截止尺度以下，磁场可以具有丰富的结构。这意味着ISM中的磁场可以在比秒差距尺度小得多的尺度上具有结构。结果表明，波数带中的磁能与波数无关，磁结构是间歇性的和各向异性的。讨论了这些结果与微尺度原子结构形成的关系。
In astrophysical situations, e.g., in the interstellar medium (ISM), neutrals can provide viscous damping on scales much larger than the magnetic diffusion scale. Through numerical simulations, we have found that the magnetic field can have a rich structure below the dissipation cutoff scale. This implies that magnetic fields in the ISM can have structures on scales much smaller than parsec scales. Our results show that the magnetic energy contained in a wavenumber band is independent of the wavenumber and that magnetic structures are intermittent and extremely anisotropic. We discuss the relation between our results and the formation of the tiny-scale atomic structure.