The dependence of the sources and properties of the near-Earth solar wind on solar cycle activity is an important issue in solar and space physics. We use the improved “two-step” mapping procedure that takes into account the initial acceleration processes to trace the near-Earth solar winds back to their source regions from 1999–2020, covering solar cycles (SCs) 23 and 24. Then, the solar wind is categorized into coronal hole (CH), active region (AR), and quiet Sun (QS) solar wind based on the source region type. We find that the proportions of CH and AR (QS) wind during SC 23 are higher (lower) than those during SC 24. During solar maximum and declining phases, the magnetic field strength, speed, helium abundance (AHe), and charge states of all three types of solar wind during SC 23 are generally higher than those during SC 24. During solar minimum, these parameters of solar wind are generally lower during SC 23 than those during SC 24. There is a significant decrease in the charge states of all three types of solar wind during the solar minimum of SC 23. The present statistical results demonstrate that the sources and properties of the solar wind are both influenced by solar cycle amplitude. The temperatures of AR, QS, and CH regions exhibit significant differences at low altitudes, whereas they are almost uniform at high altitudes.

中文翻译：

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第23和第24太阳周期近地太阳风的起源和性质的差异


近地太阳风的来源和性质对太阳周期活动的依赖性是太阳和空间物理学中的一个重要问题。我们使用改进的“两步”制图程序，该程序考虑了初始加速过程，将 1999 年至 2020 年的近地太阳风追溯到其源区，涵盖太阳周期 (SC) 23 和 24。太阳风根据源区类型分为冕洞（CH）、活跃区（AR）和安静太阳（QS）太阳风。我们发现SC 23期间CH和AR（QS）风的比例高于（低于）SC 24期间的比例。在太阳活动极大期和太阳衰落阶段，磁场强度、速度、氦丰度（AHe）和电荷状态SC 23期间所有三种类型太阳风的参数通常都高于SC 24期间的参数。在太阳活动极小期期间，太阳风的这些参数通常在SC 23期间低于SC 24期间。 SC 23 太阳极小期期间的所有三种类型的太阳风。目前的统计结果表明，太阳风的来源和性质均受到太阳周期振幅的影响。 AR、QS和CH地区的气温在低海拔地区表现出显着差异，而在高海拔地区则几乎一致。