论文标题
在剪切磁场中拱形磁化实验室等离子体的演变
Evolution of an arched magnetized laboratory plasma in a sheared magnetic field
论文作者
论文摘要
拱形磁化结构是太空和实验室等离子体中的常见发生。弓形磁化等离子体的实验室实验的结果（$β\约10^{ - 3} $，lundquist $ \ of 10^{4} $，Plasma Radius/ion gyroradius $ \ of 20 $）在剪切的磁性构型中呈现。该实验旨在模拟与太阳大气中相似结构的形成和不稳定相关的条件。几乎水平上覆的磁场的大小变化以研究其对拱形等离子体的扭曲和扭曲的影响。另外，指导磁场的方向变化了，以研究其在形成正向或反向S形等离子结构中的作用。拱形等离子体中的电流远低于使其扭结不稳定所需的电流。观察到较大的上覆磁场的幅度，观察到拱形等离子体的扭曲的显着增加。对于与初始拱形等离子体电流的几乎平行的指导磁场观察到了前进弓形等离子体，而平行方向产生了反向S形的拱形等离子体。
Arched magnetized structures are a common occurrence in space and laboratory plasmas. Results from a laboratory experiment on spatio-temporal evolution of an arched magnetized plasma ($β\approx 10^{-3}$, Lundquist number $\approx 10^{4}$, plasma radius/ion gyroradius $\approx 20$) in a sheared magnetic configuration are presented. The experiment is designed to model conditions relevant to the formation and destabilization of similar structures in the solar atmosphere. The magnitude of a nearly horizontal overlying magnetic field was varied to study its effects on the writhe and twist of the arched plasma. In addition, the direction of guiding magnetic field was varied to investigate its role in formation of either forward- or reverse-S shaped plasma structures. The electrical current in the arched plasma was well below the current required to make it kink unstable. A significant increase in the writhe of the arched plasma was observed with larger magnitudes of overlying magnetic field. Forward-S shaped arched plasma was observed for a guiding magnetic field oriented nearly anti-parallel to the initial arched plasma current, while the parallel orientation yielded the reverse-S shaped arched plasma.
