非麦克斯韦各向异性逆流等离子体中韦伯型不稳定性的累积效应
Cumulative effect of Weibel-type instabilities in counterstreaming plasmas with non-Maxwellian anisotropies
摘要：
逆流等离子体结构广泛存在于实验室实验和天体物理系统中，研究逆流等离子体结构可以防止束流等离子体实验中出现的不稳定模，也可以证明天体物理中大尺度磁场的存在。成丝不稳定性出现在逆流等离子体中，并负责等离子体的磁化。假设每个逆流等离子体都具有各向同性的洛伦兹（kappa）分布，来描述丝状不稳定模式。在这种情况下，双折射不稳定性增长率可以达到一个最大值，显着大于具有麦克斯韦分布函数的等离子体。这种行为是相反的，观察到的韦伯不稳定性增长率在一个双κ等离子体，这是总是小于所获得的双麦克斯韦等离子体。该方法被进一步推广为具有双κ温度各向异性的逆流等离子体。在这种情况下，当等离子体在流动方向上更热时，通过韦伯效应增强了压缩不稳定性增长率，并且增长率变得更大。这些效应显著提高了磁场产生的效率，并为快速磁化场景中的韦伯型不稳定性的潜在作用提供了进一步的支持。
英文摘要：
Counterstreaming plasma structures are widely present in laboratory experiments and astrophysical systems, and they are investigated either to prevent unstable modes arising in beam-plasma experiments or to prove the existence of large scale magnetic fields in astrophysical objects. Filamentation instability arises in a counterstreaming plasma and is responsible for the magnetization of the plasma. Filamentationally unstable mode is described by assuming that each of the counterstreaming plasmas has an isotropic Lorentzian (kappa) distribution. In this case, the filamentation instability growth rate can reach a maximum value markedly larger than that for a a plasma with a Maxwellian distribution function. This behaviour is opposite to what was observed for the Weibel instability growth rate in a bi-kappa plasma, which is always smaller than that obtained for a bi-Maxwellian plasma. The approach is further generalized for a counterstreaming plasma with a bi-kappa temperature anisotropy. In this case, the filamentation instability growth rate is enhanced by the Weibel effect when the plasma is hotter in the streaming direction, and the growth rate becomes even larger. These effects improve significantly the efficiency of the magnetic field generation, and provide further support for the potential role of the Weibel-type instabilities in the fast magnetization scenarios.
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