Tsung F S, Morales G J, Leboeuf J N
Department of Physics and Astronomy, University of California-Los Angeles, 90095, USA.
Phys Rev Lett. 2003 Feb 7;90(5):055004. doi: 10.1103/PhysRevLett.90.055004. Epub 2003 Feb 6.
A particle-in-cell code is used to investigate the evolution of a density plume moving through a background plasma with supersonic speed directed along the confinement magnetic field. For scale lengths representative of laboratory and auroral phenomena, the major nonlinear effects identified by the present simulations are the formation of a bipolar current system from the ballistic electrons, the appearance of transient potential layers, and the carving of deep density cavities. A 3D magnetic topology is generated by the self-consistent ballistic and diamagnetic currents that accompany highly localized potential layers.
采用粒子模拟程序研究密度羽状物在背景等离子体中沿约束磁场以超音速运动的演化过程。对于代表实验室和极光现象的尺度长度，当前模拟所识别出的主要非线性效应包括：弹道电子形成双极电流系统、瞬态势层的出现以及深度密度空洞的刻蚀。高度局域化势层伴随的自洽弹道电流和抗磁电流产生了三维磁拓扑结构。
