A one dimensional, electrostatic Vlasov model for the generation of suprathermal electron tails in solar wind conditions
A one dimensional, electrostatic Vlasov model for the generation of suprathermal electron tails in solar wind conditions
复制标题
用于在太阳风条件下产生超热电子尾的一维静电 Vlasov 模型
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Mangeney
中科院分区：
文献类型：
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作者：
F. Califano;A. Mangeney
[1] 太空和实验室无碰撞等离子体通常不符合局部热力学平衡。特别是，它们的带电粒子速度分布通常不同于简单的麦克斯韦分布，并表现出各种各样的各向异性和成分，例如超热束和尾部。在这里，我们提出了一种新模型，负责电子超热尾的“局部”起源。该模型基于向弗拉索夫-泊松方程组添加高频和低频外强迫。第一个主要代表由电荷分离效应产生的热噪声电场。第二个代表由大规模流体（MHD）湍流产生的能量级联产生的能量注入。我们发现，在典型的太阳风条件下，我们的模型可以成为完整的三维电磁模型的基础，能够解释在电子分布函数上观察到的电子晕群的局部生成。
[1] Space and laboratory collisionless plasmas are most often out of local thermodynamic equilibrium. In particular, their charged particle velocity distributions usually differ from simple Maxwellian distributions and exhibit a great variety of anisotropies and components such as suprathermal beams and tails. Here we propose a new model responsible for a “local” origin of electron suprathermal tails. The model is based on adding a high and a low frequency external forcing to the Vlasov-Poisson system of equations. The first one represents mainly the thermal noise electric field generated by charge separation effects. The second one represents the energy injection resulting from the energy cascade generated by the large scale fluid (MHD) turbulence. We find that in typical solar wind conditions, our model could be the base of a full three dimensional, electromagnetic model capable of explaining the local generation of the electron halo population observed on the electron distribution function.