Cosmic magnetization: from spontaneously emitted aperiodic turbulent to ordered equipartition fields.
Cosmic magnetization: from spontaneously emitted aperiodic turbulent to ordered equipartition fields.
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宇宙磁化：从自发发射的非周期性湍流到有序均分场。
DOI：
10.1103/physrevlett.109.261101
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发表时间：
2012
影响因子：
8.6
通讯作者：
R. Schlickeiser
中科院分区：
文献类型：
--
作者：
R. Schlickeiser
结果表明，非磁化非相对论热电子-质子等离子体自发地产生强度为|δB|=3.5β(E)g(1/3)W(E)(1/2) G的非周期湍流磁场涨落，其中β(E)为归一化热电子温度，W(E)为热等离子体能量密度，g为等离子体参数.对于未磁化的星际介质，在再电离开始后不久，这种机制产生的场强在宇宙空洞中约为2×10(-16) G，在原星系中约为2×10(-10) G，两者都太弱，不足以影响等离子体的动力学。考虑到同时的粘性阻尼，这些估计在宇宙空洞和原星系中分别减少到2×10(-21) G和2×10(-12) G。第一次超新星爆发对星系间和原星系介质施加的剪切和/或压缩在局部放大了这些种子场，使它们各向异性，直到磁恢复力影响到接近统一的有序等离子体的气体动力学。
It is shown that an unmagnetized nonrelativistic thermal electron-proton plasma spontaneously emits aperiodic turbulent magnetic field fluctuations of strength |δB|=3.5β(e)g(1/3)W(e)(1/2) G, where β(e) is the normalized thermal electron temperature, W(e) the thermal plasma energy density, and g the plasma parameter. For the unmagnetized intergalactic medium, immediately after the reionization onset, the field strengths from this mechanism are about 2×10(-16) G in cosmic voids and 2×10(-10) G in protogalaxies, both too weak to affect the dynamics of the plasma. Accounting for simultaneous viscous damping reduces these estimates to 2×10(-21) G in cosmic voids and 2×10(-12) G in protogalaxies. The shear and/or compression of the intergalactic and protogalactic medium exerted by the first supernova explosions locally amplify these seed fields and make them anisotropic, until the magnetic restoring forces affect the gas dynamics at ordered plasma betas near unity.
第一批恒星和星系形成过程中的小规模发电机作用 - I 理想 MHD 极限
影响因子：
6.5
作者：
Schleicher;D. R. G;Banerjee;Arshakian
通讯作者：
Arshakian