Energetic particle transport in the interplanetary medium is known to be affected by magnetic structures. It has been demonstrated for solar energetic particles in near-Earth orbit studies, and also for the more energetic cosmic rays. In this paper, we show observational evidence that intensity variations of solar energetic particles can be correlated with the occurrence of helical magnetic flux tubes and their boundaries. The analysis is carried out using data from Parker Solar Probe orbit 5, in the period 2020 May 24 to June 2. We use FIELDS magnetic field data and energetic particle measurements from the Integrated Science Investigation of the Sun (IS⊙IS) suite on the Parker Solar Probe. We identify magnetic flux ropes by employing a real-space evaluation of magnetic helicity, and their potential boundaries using the Partial Variance of Increments method. We find that energetic particles are either confined within or localized outside of helical flux tubes, suggesting that the latter act as transport boundaries for particles, consistent with previously developed viewpoints.

中文翻译：

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帕克太阳探测器观测螺旋结构作为高能粒子的边界

已知行星际介质中的高能粒子传输受磁性结构的影响。它已在近地轨道研究中被证明适用于太阳高能粒子，也适用于更高能的宇宙射线。在本文中，我们展示了观测证据表明太阳高能粒子的强度变化可能与螺旋磁通管及其边界的出现有关。该分析使用来自帕克太阳探测器 5 号轨道的数据，在 2020 年 5 月 24 日至 6 月 2 日期间进行。我们使用来自太阳综合科学调查 (IS⊙IS) 套件的 FIELDS 磁场数据和高能粒子测量帕克太阳探测器。我们通过对磁螺旋度的真实空间评估来识别磁通绳，及其使用增量的部分方差方法的潜在边界。我们发现高能粒子要么被限制在螺旋通量管内，要么位于螺旋通量管外，这表明后者充当粒子的传输边界，这与先前发展的观点一致。