论文标题
Parker太阳能探测器观测到冠状孔边界的外电子通量增强功能
Parker Solar Probe Observations of Suprathermal Electron Flux Enhancements Originating from Coronal Hole Boundaries
论文作者
论文摘要
理论上将一对太阳能磁通元件对之间的重新连接被认为是维持电晕的结构和产生太阳风的关键过程。预计这种“互换重新连接”在冠状孔(CHS)的开放式边界上特别活跃。对1AU太阳风数据的先前分析表明,在慢速流界面处超颗粒磁带的峰值可能是由与CH边界的磁连接引起的,而不是诸如压缩的动态效应。此外,建议峰值和流界面位置之间的偏移是源互换重新连接的结果。作为对这些建议的初步测试,我们分析了在第一个Parker太阳能探针(PSP)围场期间观察到的两个太阳风流,每种都与赤道CH边界相关联(一个领先者(一个领先者,一个在旋转方面)。每个流都具有超颗粒电子通量的峰值,其位置和相关的血浆特性表明了太阳能起源,这与1AU观测的先前建议一致。通量峰的位置和其他特征之间的差异表明,这些峰也可以通过源区域的交换重新连接来移动。尽管随机的脚点运动或其他解释仍然可行,但我们对每个事件的解释与全球开放通量传输的模式兼容。这些探索性结果凸显了有关汇总重新连接和频率运输在CH边界与现代近似任务的统计研究的未来机会。
Reconnection between pairs of solar magnetic flux elements, one open and the other a closed loop, is theorised to be a crucial process for both maintaining the structure of the corona and producing the solar wind. This 'interchange reconnection' is expected to be particularly active at the open-closed boundaries of coronal holes (CHs). Previous analysis of solar wind data at 1AU indicated that peaks in the flux of suprathermal electrons at slow-fast stream interfaces may arise from magnetic connection to the CH boundary, rather than dynamic effects such as compression. Further, offsets between the peak and stream interface locations are suggested to be the result of interchange reconnection at the source. As a preliminary test of these suggestions, we analyse two solar wind streams observed during the first Parker Solar Probe (PSP) perihelion encounter, each associated with equatorial CH boundaries (one leading and one trailing with respect to rotation). Each stream features a peak in suprathermal electron flux, the locations and associated plasma properties of which are indicative of a solar origin, in agreement with previous suggestions from 1AU observations. Discrepancies between locations of the flux peaks and other features suggest these peaks may too be shifted by source region interchange reconnection. Our interpretation of each event is compatible with a global pattern of open flux transport, although random footpoint motions or other explanations remain feasible. These exploratory results highlight future opportunities for statistical studies regarding interchange reconnection and flux transport at CH boundaries with modern near-Sun missions.