On Cosmic Magnetic Fields
On Cosmic Magnetic Fields
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论宇宙磁场
DOI：
10.1073/pnas.43.1.24
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发表时间：
1957
影响因子：
11.1
通讯作者：
S. Chandrasekhar
中科院分区：
文献类型：
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作者：
S. Chandrasekhar
4. 根据方程（2）和（3），当磁场的能量密度相当于或超过质量运动的能量密度时的行为规范与如果不是这种情况时的行为规范有很大不同。因此，如果磁场主导并决定运动，我们可以预期磁场和运动的模式会沿着两个方向之一演化：要么磁场发生改变，使其对运动的影响逐渐减少并最终达到静止状态，要么运动以磁场为代价被放大，直到两个场之间的相互作用达到某种平衡。 5. 为了实现设想的两个最终状态中的第一个，有必要在限度内：
4. In virtue of equations (2) and (3), the norm of behavior when the energy density of the magnetic field is comparable to, or exceeds, the energy density of the mass motions is quite different from what it would be if this were not the case. Thus, if the magnetic field dominates and determines the motions, we may expect the pattern of the field and of the motions to evolve along one of two directions: Either the magnetic field gets altered in such a way that its influence on the motions is progressively reduced and a stationary static state is eventually reached, or the motions are amplified at the expense of the field until some kind of a balance in the interaction between the two fields is reached. 5. For the attainment of the first of the two end states envisaged, it is necessary that, in the limit,