论文标题
关于空间等离子体中相干结构的识别：磁性螺旋-PVI方法
On the Identification of Coherent Structures in Space Plasmas: the Magnetic Helicity-PVI Method
论文作者
论文摘要
血浆湍流可以看作是由大小相干结构填充的磁性景观。在这个复杂的网络中，大型螺旋磁管可能会被小型磁重新连接事件（电流板）隔开。但是，在连续的数据流中鉴定这些磁性结构一直是一项具有挑战性的任务。在这里，我们提出了一种能够根据过滤的磁性螺旋性（$ h_m $）和增量（PVI）组合使用（$ h_m $）的结合使用来表征湍流太阳风的大小和小规模结构的方法。这种简单的单飞机技术已经通过直接的血浆湍流数值模拟对其进行了验证，然后应用于Parker Solar Probe（PSP）任务的数据。这种新颖的分析结合了$ h_m $＆PVI方法，表明大量通量管填充了太阳风，并连续合并在可能发生磁性重新连接和粒子加速的接触区域中。
Plasma turbulence can be viewed as a magnetic landscape populated by large and small scale coherent structures. In this complex network, large helical magnetic tubes might be separated by small scale magnetic reconnection events (current sheets). However, the identification of these magnetic structures in a continuous stream of data has always been a challenging task. Here we present a method that is able to characterize both the large and small scale structures of the turbulent solar wind, based on the combined use of a filtered magnetic helicity ($H_m$) and the Partial Variance of Increments (PVI). This simple, single-spacecraft technique, has been validated first via direct numerical simulations of plasma turbulence and then applied to data from the Parker Solar Probe (PSP) mission. This novel analysis, combining $H_m$&PVI methods, reveals that a large number of flux tubes populate the solar wind and continuously merge in contact regions where magnetic reconnection and particle acceleration may occur.
