The Weibel instability inside the electron-positron Harris sheet
The Weibel instability inside the electron-positron Harris sheet
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DOI：
10.1063/1.3097474
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发表时间：
2009-01
影响因子：
2.2
通讯作者：
Yi‐Hsin Liu;M. Swisdak;J. Drake
中科院分区：
文献类型：
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作者：
Yi‐Hsin Liu;M. Swisdak;J. Drake
最近的电子-正电子重联的全粒子模拟表明，韦伯不稳定性在控制电流层的动力学和维持快速重联中起着积极的作用。一个四束模型的发展，探讨不稳定性的发展在一个狭窄的电流层特性的重联。问题归结为两个耦合的二阶微分方程，其增长的本征模通过渐近近似和有限差分方法得到。全粒子模拟证实了线性理论，并有助于探索非线性发展的不稳定性。重联流出射流中的电流层加宽与高速流动粒子在韦伯产生的面外磁场中的散射有关。
Recent full-particle simulations of electron-positron reconnection revealed that the Weibel instability plays an active role in controlling the dynamics of the current layer and maintaining fast reconnection. A four-beam model is developed to explore the development of the instability within a narrow current layer characteristic of reconnection. The problem is reduced to two coupled second-order differential equations, whose growing eigenmodes are obtained via both asymptotic approximations and finite difference methods. Full particle simulations confirm the linear theory and help probe the nonlinear development of the instability. The current layer broadening in the reconnection outflow jet is linked to the scattering of high-velocity streaming particles in the Weibel-generated, out-of-plane magnetic field.