局域星际介质中的非Kolmogorov类Turbulence
Non Kolmogorov-like Turbulence in the Local Interstellar Medium
摘要：
建立了一个局部星际介质湍流的自洽模型。该模型描述了一个部分电离的磁流体ISM中，中性氢流体与等离子体的相互作用主要通过电荷交换。模式中的ISM湍流相关尺度远大于激波特征尺度。与流体中小长度尺度的线性碰撞耗散不同，电荷交换过程在各种ISM长度尺度上可能会不可预测地有效，具体取决于中性和等离子体密度、电荷交换截面和特征长度尺度。我们发现，从缩放参数的电荷交换相互作用修改光谱转移与大规模的能量包含漩涡。因此，ISM湍流叶栅比Kolmogorov现象学预测的要陡。
英文摘要：
We develop a self-consistent model of turbulence in a local interstellar medium (ISM). The model describes a partially ionized magnetofluid ISM in which a neutral hydrogen fluid interacts with a plasma dominantly through a charge exchange. The ISM turbulent correlation scales in our model are much bigger than the shock characteristic length-scales. Unlike small length-scale linear collisional dissipation in the fluid, the charge exchange processes can be effective unpredictably on a variety of ISM length-scales depending upon the neutral and plasma densities, the charge exchange cross section and the characteristic length scales. We find, from scaling arguments that the charge exchange interactions modify spectral transfer associated with large-scale energy containing eddies. Consequently, the ISM turbulent cascade are steeper than those predicted by Kolmogorov's phenomenology.
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