Fully kinetic Biermann battery and associated generation of pressure anisotropy
Fully kinetic Biermann battery and associated generation of pressure anisotropy
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DOI：
10.1103/physreve.97.033204
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发表时间：
2018-03-26
影响因子：
2.4
通讯作者：
Silva, L. O.
中科院分区：
文献类型：
--
作者：
Schoeffler, K. M.;Loureiro, N. F.;Silva, L. O.
解析地研究了具有背景密度和温度梯度的全动力学、无碰撞系统的动力学演化。温度梯度导致了温度各向异性的产生，沿梯度方向的温度大于垂直于梯度方向的温度。这导致系统变得不稳定，主要是由于压力各向异性驱动的不稳定性，主要是电子的魏贝尔不稳定性。当密度和温度梯度同时存在且彼此不平行时，我们得到了类似Biermann的时间线性磁场增长。随之而来的胞内粒子数值模拟验证了我们的分析结果。
The dynamical evolution of a fully kinetic, collisionless system with imposed background density and temperature gradients is investigated analytically. The temperature gradient leads to the generation of temperature anisotropy, with the temperature along the gradient becoming larger than that in the direction perpendicular to it. This causes the system to become unstable to pressure anisotropy driven instabilities, dominantly to the electron Weibel instability. When both density and temperature gradients are present and nonparallel to each other, we obtain a Biermann-like linear-in-time magnetic field growth. Accompanying particle-in-cell numerical simulations are shown to confirm our analytical results.