太阳活动周调制与光球磁场所对年轻太阳风湍流的控制作用
Solar-Cycle Modulation and Photospheric Magnetic Control of Turbulence in the Young Solar Wind
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中文总结 AI 辅助
本研究结合帕克太阳探测器观测、数值模拟与遥感数据，揭示太阳活动周内年轻太阳风湍流特性的变化规律，明确其湍流特性与冕洞、活动区等太阳源区的关联。
中文摘要 AI 辅助
太阳风是从日冕膨胀并充满日球层的太阳等离子体外流，其湍流为非绝热加热和加速提供了途径，因此是理解年轻太阳风的热力学与磁流体力学（MHD）演化的核心。然而，太阳活动周内其湍流特性的变化，以及这些特性与太阳源区的关联仍未被完全理解。本研究分析了NASA帕克太阳探测器（PSP）任务的25次太阳轨道观测数据，并结合全球MHD模型、光球磁图和低日冕极紫外图，探究内日球层湍流的太阳活动周依赖性及其太阳源区。观测结果显示，涨落幅度、交叉螺旋度及相关湍流特性存在显著的太阳活动变化。通过将与PSP相连的磁通量管追溯至太阳源区，研究证实高湍动能区间优先与单极磁拓扑的冕洞源区相关联，而低湍动能区间则与多极拓扑和活动区环境相关。本研究将原位测量、数值模拟与遥感观测相结合，揭示了太阳活动周依赖性的源区结构如何决定年轻太阳风的湍流变异性与等离子体加热过程。
英文摘要
The solar wind is an outflow of solar plasma that expands from the corona to fill the heliosphere. Its turbulence provides a pathway for non-adiabatic heating and acceleration, and is therefore central to understanding the thermodynamic and magnetohydrodynamic (MHD) evolution of the young solar wind. However, the variation of its turbulence properties over the solar activity cycle and the connection of these properties to solar source regions remains incompletely understood. Here we analyze observations from 25 solar orbits of NASA's Parker Solar Probe (PSP) mission, in combination with a global MHD model, photospheric magnetograms, and extreme ultraviolet maps of the low corona, to investigate the solar-cycle dependence and the solar sources of turbulence in the very inner heliosphere. The observations reveal pronounced solar-activity variation in fluctuation amplitude, cross helicity, and related turbulence properties. By tracing PSP-connected magnetic flux tubes to their solar sources, we demonstrate that high turbulent-energy intervals are preferentially connected to coronal-hole sources with unipolar magnetic topology, whereas low turbulent-energy intervals are associated with multipolar topology and active-region environments. Our study combines in-situ measurements with numerical modeling and remote sensing observations to reveal how solar-cycle-dependent source structure determines turbulence variability and plasma heating in the young solar wind.
