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arXiv 2202.04341physics.plasm-phastro-ph.HE
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低马赫数无碰撞激波中的电子束韦伯不稳定性

Electron Beam Weibel Instability in the Collisionless Shock with Low Mach Number

Jiansheng Yao, Yingkui Zhao, Biyao Ouyang, Difa Ye

摘要:

采用粒子模拟方法研究了静电无碰撞激波中电子束的韦伯不稳定性。当非相对论入射等离子体与冷的稀等离子体碰撞时,在界面附近形成静电激波。在此基础上,由于韦伯不稳定性的存在,形成了一个附加的面外磁场。结果表明,入射热电子的各向异性不足以触发韦伯不稳定性。在稀等离子体中,冷电子激发了韦伯不稳定性。稀等离子体中的电子在被冲击电场加速到相对论速度后,具有相当大的各向异性,可以触发韦伯不稳定性

英文摘要:

The electron beam Weibel instability in the electrostatic collisionless shock is studied via particle in cell simulation. When the non-relativistic incoming plasmas collide with cold dilute plasmas, an electrostatic shock forms near the interface. Following that, a filamentary out-of-plane magnetic field is formed as a result of the Weibel instability. It is demonstrated that the anisotropy of incoming hot electrons is insufficient to trigger the Weibel instability. And the Weibel instability is excited by cold electrons in dilute plasmas. After being accelerated to relativistic velocities by the shock electric field into the dense plasmas, electrons in the dilute plasma have considerable anisotropy and can trigger the Weibel instability

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