部分电离的非常局域星际介质中turbulence的注入尺度
On the injection scale of the turbulence in the partially ionized very local interstellar medium
摘要：
在部分电离的星际介质中，磁流体动力学（MHD）湍流级联受到离子中性碰撞阻尼和中性粘性阻尼的影响。通过研究在温暖的和部分电离的本地星际介质的阻尼效应，我们发现，星际湍流阻尼中性粘度在$\sim 261$ au和不能解释的湍流磁场波动探测到的旅行者1号和2号。Voyager在VLISM（very local星际介质）中测量到的MHD湍流应该在离子与中性粒子解耦的区域中局部注入，以使其级联在阻尼效应中幸存下来。在离子中性退耦条件和观测到的Kolmogorov磁能谱的强湍流条件下，我们发现VLISM中的湍流是亚Alfvénic的，其最大可能的注入尺度是$\sim 194$ au.
英文摘要：
The cascade of magnetohydrodynamic (MHD) turbulence is subject to ion-neutral collisional damping and neutral viscous damping in the partially ionized interstellar medium. By examining the damping effects in the warm and partially ionized local interstellar medium, we find that the interstellar turbulence is damped by neutral viscosity at $\sim 261$ au and cannot account for the turbulent magnetic fluctuations detected by Voyager 1 and 2. The MHD turbulence measured by Voyager in the very local interstellar medium (VLISM) should be locally injected in the regime where ions are decoupled from neutrals for its cascade to survive the damping effects. With the imposed ion-neutral decoupling condition, and the strong turbulence condition for the observed Kolmogorov magnetic energy spectrum, we find that the turbulence in the VLISM is sub-Alfvénic, and its largest possible injection scale is $\sim 194$ au.
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