AI 中文总结
研究帕克太阳探测器数据，发现共转流中相邻快速流与其碰撞致磁场畸变等，通过守恒量径向变化评估波动能量损失，其近乎均分为加热和做功，虽加热与质子温度变化略符，但做功不足以解释太阳风加速，揭示剪切相互作用可加速慢流。
AI 中文摘要
近期对帕克太阳探测器（PSP）和太阳轨道器数据的分析表明，在日心距离15至120个太阳半径处，波动能量在太阳风的快速流中传递到整体流动。为深入了解此过程，我们分析了PSP在第10次相遇时入轨期间收集的数据，当时它与太阳近似共转，在25至45个太阳半径处检测到加速流。流动几何表明相邻快速流与共转流碰撞，导致大规模磁场畸变、密度增强和加速。波动能量沉积也能加热太阳风等离子体并做功，产生径向加速。我们通过共转流中守恒量的径向变化评估波动损失的能量，发现其几乎平均分配为加热和做功。加热与质子温度的非绝热下降略有一致，对风所做的功不足以解释测得的太阳风加速。尽管限于此事件，但观测表明剪切相互作用能够在离太阳相对短的距离内加速较慢的流，可能留下大规模密度和磁波动印记。
英文摘要
Recent analysis of Parker Solar Probe (PSP) and Solar Orbiter data indicates that fluctuations energy is transferred to the bulk flow in fast streams of the solar wind at heliocentric distances between 15 and 120 Rsun. To gain insight into this process, we analyze data collected during the inbound orbit of PSP in Encounter 10, when it is in approximate corotation with the Sun and an accelerating stream is detected between 25 and 45 Rsun. The geometry of the flow indicates that a neighboring very fast streams is colliding with the corotating stream, causing large-scale magnetic field distortion, density enhancement, and acceleration. However, also deposition of fluctuations' energy can heat and do work on the solar wind plasma, resulting in a radial acceleration. We evaluate the energy lost by fluctuations via radial variation of conserved quantities in the corotating stream and find that it is almost equally partitioned into heating and work. While the heating is marginally consistent with the non-adiabatic decrease of proton temperature, the work exerted on the wind is insufficient to account for the measured solar wind acceleration. Although limited to this event, observations suggest that shear interaction is capable of accelerating slower streams within relatively short distances from the Sun, possibly leaving its imprint as large-scale density and magnetic fluctuations.
Comments10 pages, Accepted in A&A
