论文标题
太阳风转背的分布，旋转和比例特征的分析：Parker太阳能探针的第一和第二次相遇之间的比较
Analysis of the distribution, rotation and scale characteristics of solar wind switchbacks: comparison between the first and second encounters of Parker Solar Probe
论文作者
论文摘要
由磁场线扭曲形成的太阳风中的S形磁结构称为折返，其主要特征是磁场的逆转和太阳风径向速度的显着增加。我们在帕克太阳能探测器（PSP）的前两个相遇期间识别242次折返。应用统计方法来分析折返的磁场旋转的分布和旋转角度和方向。基于圆柱磁管的假设，通过最小方差分析（MVA）方法估算了折返的直径。我们还从内部和冠状孔的边界进行了比较。主要结论如下：（1）在第一次遭遇期间观察到的折返的旋转角度似乎比一般第二次遭遇期间观察到的折返的旋转角度； （2）与环境太阳风相比，转交速度的切向组件往往更正（向西）； （3）与逆时针相比，折返更可能顺时针旋转，并且在第一和第二遭遇期间，顺时针旋转的折返数分别为1.48和2.65倍； （4）折返的直径平均约为10^5 km，并且在五个数量级（10^3-10^7 km）上。
The S-shaped magnetic structure in the solar wind formed by the twisting of magnetic field lines is called a switchback, whose main characteristics are the reversal of the magnetic field and the significant increase in the solar wind radial velocity. We identify 242 switchbacks during the first two encounters of Parker Solar Probe (PSP). Statistics methods are applied to analyze the distribution and the rotation angle and direction of the magnetic field rotation of the switchbacks. The diameter of switchbacks is estimated with a minimum variance analysis (MVA) method based on the assumption of a cylindrical magnetic tube. We also make a comparison between switchbacks from inside and the boundary of coronal holes. The main conclusions are as follows: (1) the rotation angles of switchbacks observed during the first encounter seem larger than those of the switchbacks observed during the second encounter in general; (2) the tangential component of the velocity inside the switchbacks tends to be more positive (westward) than in the ambient solar wind; (3) switchbacks are more likely to rotate clockwise than anticlockwise, and the number of switchbacks with clockwise rotation is 1.48 and 2.65 times of those with anticlockwise rotation during the first and second encounters, respectively; (4) the diameter of switchbacks is about 10^5 km on average and across five orders of magnitude (10^3 -- 10^7 km).
