Hydromagnetic wave dissipation in molecular clouds
Hydromagnetic wave dissipation in molecular clouds
复制标题
分子云中的水磁波耗散
DOI：
10.1086/161144
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
K. Josafatsson
中科院分区：
文献类型：
--
作者：
E. Zweibel;K. Josafatsson
研究了分子云环境中长波磁流体波的衰减，目的是确定在这种云中观察到的超声速运动是否可能是由于波。结果表明，平行于平均磁场传播的阿尔芬波是最长的波模。如果波长是零点几秒差距，磁场是0.1-1毫高斯，那么这种波通常可以存活长达100万年。非线性陡峭的波，然后由离子中性摩擦陡峭的波剖面似乎是最有效的阻尼机制。
The damping of long wavelength, hydromagnetic waves in molecular cloud environments is studied with the aim of determining whether the supersonic motions observed in such clouds are likely to be due to the waves. It is found that Alfven waves propagating parallel to the average magnetic field are the longest lived wave modes. Such waves can typically survive for as long as one-million years if the wavelength is as long as a few tenths of a pc and the magnetic field is 0.1-1 milligauss. Nonlinear steepening of the waves followed by ion-neutral friction in the steepened wave profiles appears to be the most effective damping mechanism.