ENVIRONMENTS FOR MAGNETIC FIELD AMPLIFICATION BY COSMIC RAYS
ENVIRONMENTS FOR MAGNETIC FIELD AMPLIFICATION BY COSMIC RAYS
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宇宙射线磁场放大的环境
DOI：
10.1088/0004-637x/709/2/1412
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Everett
中科院分区：
文献类型：
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作者：
E. Zweibel;J. Everett
我们考虑了最近发现的一类在各种环境中由宇宙射线流驱动的不稳定性。我们表明，虽然这些不稳定性主要是在超新星驱动的星际冲击的背景下进行了讨论，他们也可以在星系际介质和星系中的弱磁场，在那里，作为一个强大的螺旋磁波动的来源，他们可能有助于磁场的整体演化。在银河系内，这些不稳定性在温暖的电离气体中最强，在热的低密度气体中似乎很弱，除非宇宙射线的注入效率非常高。
We consider a recently discovered class of instabilities, driven by cosmic ray streaming, in a variety of environments. We show that although these instabilities have been discussed primarily in the context of supernova-driven interstellar shocks, they can also operate in the intergalactic medium and in galaxies with weak magnetic fields, where, as a strong source of helical magnetic fluctuations, they could contribute to the overall evolution of the magnetic field. Within the Milky Way, these instabilities are strongest in warm ionized gas and appear to be weak in hot, low density gas unless the injection efficiency of cosmic rays is very high.