由等离子体β和交叉 helicity 调控的离子尺度波：不平衡太阳风湍流中 helicity 壁垒的观测证据
Ion-Scale Waves Regulated by Plasma Beta and Cross Helicity: Observational Evidence for the Helicity Barrier in Imbalanced Solar Wind Turbulence
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中文总结 AI 辅助
该研究基于帕克太阳探测器观测，发现近太阳太阳风离子尺度波的出现率与等离子体β、交叉 helicity 相关，为 helicity 壁垒理论提供了观测证据。
中文摘要 AI 辅助
离子尺度波被认为在太阳日冕和太阳风的加热中发挥重要作用，但其产生机制仍不明确。本文基于帕克太阳探测器（Parker Solar Probe）的观测结果，研究了日心距离在0.1至0.2天文单位（au）范围内的近太阳太阳风中离子尺度波的出现情况。结果表明，左旋偏振波的出现率显著依赖于等离子体β（β）和交叉 helicity（σ_c）：出现率随β减小而快速上升，随σ_c增大而快速上升；当β<0.2且σ_c>0.7时，出现率整体超过45%。这些观测结果与 helicity 壁垒理论的直接预测一致，该理论认为离子回旋波由不平衡磁化湍流产生。
英文摘要
Ion-scale waves are believed to play an important role in heating of the solar corona and wind, though their generation mechanism remains unclear. Based on Parker Solar Probe observations, this Letter investigates the occurrence of ion-scale waves in the near-Sun solar wind with heliocentric distances between 0.1 and 0.2 au. Results show that the occurrence rate of left-handed polarized waves significantly depends on the plasma beta ($β$) and cross helicity ($σ_c$). The occurrence rate rapidly increases with decreasing $β$ and increasing $σ_c$. Overall, the occurrence rate exceeds 45$\%$ when $β<0.2$ and $σ_c > 0.7$ are satisfied. These observations are consistent with the direct predictions of the helicity barrier theory that suggests the generation of ion cyclotron waves via imbalanced magnetized turbulence.
发表机构
- Institute of Space Physics, Luoyang Normal University（洛阳理工学院空间物理研究所）
- Henan Key Laboratory of Electromagnetic Transformation and Detection（河南省电磁转换与探测重点实验室）
- Space Science Center and Department of Physics and Astronomy, University of New Hampshire（新罕布什尔大学空间科学中心及物理与天文学系）
- Department of Physics, University of Otago（奥塔哥大学物理系）
- Research Center for Novel Solar-Blind Ultraviolet and Infrared Photoelectronic Detectors of Henan province（河南省新型日盲紫外红外光电探测器研究中心）
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