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arXiv 0909.4738astro-ph.SR
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沿准分界线层的磁重联作为泛在活动区流出的驱动器

Magnetic Reconnection along Quasi-Separatrix Layers as a Driver of Ubiquitous Active Region Outflows

D. Baker, L. van Driel-Gesztelyi, C. H. Mandrini, P. Demoulin, M. J. Murray

摘要:

Hinode的EUV成像光谱仪(EIS)已经发现了从活跃区域(AR)流出的几到50公里/秒的无处不在的外流。这些流出在AR边界处最突出,并出现在单极磁性区域上。它们与强的非热谱线展宽有关,并且在较热的EUV谱线中更强。外流至少持续了几天。使用Hinode EIS和X射线望远镜观测AR 10942加上磁性建模,我们证明了流出源自特定位置的磁场拓扑结构,其中磁力线显示强梯度的磁连接,即准分界线层(QSL),或在无限薄的QSL,分界线的限制。我们发现,最强的AR外流是在附近的QSL部分位于地区的强磁场。我们认为,磁重联在QSL分离封闭的磁场线的AR和大规模的外部连接或"开放"的磁场线是一个可行的机制,驱动AR外流,这是可能的缓慢的太阳风的来源。

英文摘要:

Hinode's EUV Imaging Spectrometer (EIS) has discovered ubiquitous outflows of a few to 50 km/sec from active regions (ARs). These outflows are most prominent at the AR boundary and appear over monopolar magnetic areas. They are linked to strong non-thermal line broadening and are stronger in hotter EUV lines. The outflows persist for at least several days. Using Hinode EIS and X-Ray Telescope observations of AR 10942 coupled with magnetic modeling, we demonstrate that the outflows originate from specific locations of the magnetic topology where field lines display strong gradients of magnetic connectivity, namely quasi-separatrix layers (QSLs), or in the limit of infinitely thin QSLs, separatrices. We found the strongest AR outflows to be in the vicinity of QSL sections located over areas of strong magnetic field. We argue that magnetic reconnection at QSLs separating closed field lines of the AR and either large-scale externally connected or `open' field lines is a viable mechanism for driving AR outflows which are likely sources of the slow solar wind.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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