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arXiv physics/0608175physics.plasm-phphysics.comp-ph
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无碰撞磁重联的动力学Vlasov模拟

Kinetic Vlasov Simulations of collisionless magnetic Reconnection

H. Schmitz, R. Grauer

摘要:

介绍了地球空间环境建模(GEM)磁重联挑战赛的全动力学Vlasov模拟。与以前的动力学模拟使用粒子在细胞(PIC)的代码,确认PIC和Vlasov代码发现良好的协议。在后者中,完整的分布函数$f_k$($k=i,e$)在相空间中的数值网格上离散化。与PIC模拟相反,Vlasov代码不受数值噪声的影响,并且允许对分布函数进行更详细的调查。欧姆定律的不同贡献的作用进行了比较,通过计算每个条款的时刻的$f_k$。电子压力张量的非对角元的重要作用可以得到证实。X线处的感应电场主要由非回旋电子压力决定,而体电子惯性的影响较小。对扩散区电子分布函数的详细分析揭示了非回旋项的动力学起源。

英文摘要:

A fully kinetic Vlasov simulation of the Geospace Environment Modeling (GEM) Magnetic Reconnection Challenge is presented. Good agreement is found with previous kinetic simulations using particle in cell (PIC) codes, confirming both the PIC and the Vlasov code. In the latter the complete distribution functions $f_k$ ($k=i,e$) are discretised on a numerical grid in phase space. In contrast to PIC simulations, the Vlasov code does not suffer from numerical noise and allows a more detailed investigation of the distribution functions. The role of the different contributions of Ohm's law are compared by calculating each of the terms from the moments of the $f_k$. The important role of the off--diagonal elements of the electron pressure tensor could be confirmed. The inductive electric field at the X--Line is found to be dominated by the non--gyrotropic electron pressure, while the bulk electron inertia is of minor importance. Detailed analysis of the electron distribution function within the diffusion region reveals the kinetic origin of the non--gyrotropic terms.

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