Spontaneous focusing of plasma flow in a weak perpendicular magnetic field

Toseo Moritaka, Yasuhiro Kuramitsu, Yao Li Liu, Shih Hung Chen

研究成果: 雜誌貢獻期刊論文同行評審

16 引文 斯高帕斯(Scopus)

摘要

Structure formation of high-beta plasma flow in a perpendicular magnetic field is investigated in the ion kinetic regime by a fully kinetic particle-in-cell simulation. We demonstrate that directional plasma flow is spontaneously focused to form a sharp density structure. The primary focusing process comes from field-aligned electron inflow associated with the whistler mode and plasma confinement due to a self-generated magnetic field. The resulting concave magnetic field lines modulate ion gyration to cause a secondary focusing process with significant plasma concentration. Required conditions for these processes are determined by a dimensionless parameter α=βi0Wi0), where βi0, ΔW, and ρi0 denote the plasma kinetic beta, window size, and ion gyration radius, respectively. The focusing process is apparent for small α, whereas diamagnetic expansion is dominant for large α. This condition describes a transition between diamagnetic cavity formation and the focusing process.

原文???core.languages.en_GB???
文章編號032110
期刊Physics of Plasmas
23
發行號3
DOIs
出版狀態已出版 - 1 3月 2016

指紋

深入研究「Spontaneous focusing of plasma flow in a weak perpendicular magnetic field」主題。共同形成了獨特的指紋。

引用此