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arXiv 1909.02149physics.plasm-phphysics.space-ph
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动力通量绳:Vlasov-Poisson-Ampère系统的Bernstein-Greene-Kruskal模

Kinetic Flux Ropes: Bernstein-Greene-Kruskal Modes for the Vlasov-Poisson-Ampère System

C. S. Ng

摘要:

在空间等离子体的许多区域,包括太阳风、磁层、极光加速区,都观测到了静电结构。其中一些结构的一个可能的理论描述是伯恩斯坦-格林-克鲁斯卡尔(BGK)模式的概念,这是无碰撞动力学理论中弗拉索夫-泊松方程组的精确非线性稳态解。我们将具有有限磁场强度的磁化等离子体中的二维BGK模式的精确解[Ng,Bhattacharjee和Skiff,Phys. Plasmas { \bf 13},055903(2006)]推广到具有方位角磁场的情况,使得这些结构承载电流以及稳定的电场和磁场。这样的非线性解现在正好满足Vlasov-Poisson-Ampère方程组。给出了具有正或负电势结构的显式例子。

英文摘要:

Electrostatic structures have been observed in many regions of space plasmas, including the solar wind, the magnetosphere, the auroral acceleration region. One possible theoretical description of some of these structures is the concept of Bernstein-Greene-Kruskal (BGK) modes, which are exact nonlinear steady-state solutions of the Vlasov-Poisson system of equations in collisionless kinetic theory. We generalize exact solutions of two-dimensional BGK modes in a magnetized plasma with finite magnetic field strength [Ng, Bhattacharjee, and Skiff, Phys. Plasmas {\bf13}, 055903 (2006)] to cases with azimuthal magnetic fields so that these structures carry electric current as well as steady electric and magnetic fields. Such nonlinear solutions now satisfy exactly the Vlasov-Poisson-Ampère system of equations. Explicit examples with either positive or negative electric potential structure are provided.

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