超气泡、银河系发电机和尖峰不稳定性
Superbubbles, Galactic Dynamos and the Spike Instability
摘要：
我们提请注意一个问题时，它被应用到银河系磁场的假设下，完美的磁通冻结的起源与阿尔法-欧米茄发电机。标准理论包括排出不需要的通量，并且由于通量冻结，锚定在该通量上的质量也必须被排出。强大的银河系引力场使得这在能量上是不可能的。它表明，如果只有短片段的不需要的场线被驱逐，那么质量可以沿着这些场线，而不需要太多的能量。这种只有很短的力线的驱逐可以通过与巨大的天体物理超级气泡相关的尖峰不稳定性来完成。这种不稳定性的物理进行了讨论，其结果使估计作出的数量尖峰在星系中。看起来，在十亿年的发电机时间里，可能有足够的尖峰将所有不需要的线切割成几千秒差距那么短的碎片。然后，这些切割的片段可以通过阿尔法-欧米茄扩散在发电机时间内随机旋转，并且有足够的旋转来去除不需要的通量，而不驱逐场本身。尖峰过程似乎足够强大，可以让阿尔法-欧米茄发电机在没有边界条件问题的情况下产生银河场。
英文摘要：
We draw attention to a problem with the alpha-Omega dynamo when it is applied to the origin of the galactic magnetic field under the assumption of perfect flux freezing. The standard theory involves the expulsion of undesirable flux and, because of flux freezing, the mass anchored on this flux also must be expelled. The strong galactic gravitational field makes this impossible on energetic grounds. It is shown that if only short pieces of the undesirable field lines are expelled, then mass can flow down along these field lines without requiring much energy. This expulsion of only short lines of force can be accomplished by a spike instability associated with gigantic astrophysical superbubbles. The physics of this instability is discussed and the results enable an estimate to be made of the number of spikes in the galaxy. It appears that there are probably enough spikes to cut all the undesirable lines into pieces as short as a couple of kiloparsecs during a dynamo time of a billion years. These cut pieces then may be randomly rotated in a dynamo time by alpha-Omega diffusion and there is enough rotation to get rid of the undesirable flux without expelling the fields themselves. The spike process seems strong enough to allows the alpha-Omega dynamo to create the galactic field without any trouble from the boundary condition problem.
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