论文标题
折返：统计属性和偏离alfvénicity
Switchbacks: statistical properties and deviations from alfvénicity
论文作者
论文摘要
{帕克太阳探针的第一次太阳能遭遇揭示了突然的磁场偏转的存在，这些磁场偏转被称为折返，并且与慢速AlfvénicSolarWind中的质子速度增强相关。} {我们研究了它们的统计属性，特别关注其边界。} {使用Sweap and Fields的界限。} {利用Exeap and Fields的数据进行了粒子和波波域的属性。用最小差异技术分析磁性边界。} {折回式折返在73 \％的情况下是Alfvénic，在27 \％中可压缩。磁场幅度与密度波动之间的相关性揭示了正相关和负相关的存在，并且磁场幅度的扰动不存在。折返不会导致环境场中的磁剪切。他们的边界可以用旋转或切向不连续性来解释。前者更频繁。} {我们的发现对折返的可能产生机制提供了约束，这也必须能够考虑不纯粹纯粹的alfvénic的结构。表现出所述特征的可能的候选人之一是消防不稳定。}
{Parker Solar Probe's first solar encounter has revealed the presence of sudden magnetic field deflections that are called switchbacks and are associated with proton velocity enhancements in the slow alfvénic solar wind.} {We study their statistical properties with a special focus on their boundaries.} {Using data from SWEAP and FIELDS we investigate particle and wavefield properties. The magnetic boundaries are analyzed with the minimum variance technique.} {Switchbacks are found to be alfvénic in 73\% of the cases and compressible in 27\%. The correlations between magnetic field magnitude and density fluctuations reveal the existence of both positive and negative correlations, and the absence of perturbations of the magnetic field magnitude. Switchbacks do not lead to a magnetic shear in the ambient field. Their boundaries can be interpreted in terms of rotational or tangential discontinuities. The former are more frequent.} {Our findings provide constraints on the possible generation mechanisms of switchbacks, which has to be able to account also for structures that are not purely alfvénic. One of the possible candidates, among others, manifesting the described characteristics is the firehose instability.}
