论文标题
闭合磁场线的存在横穿冠状孔边界
Existence of The Closed Magnetic Field Lines Crossing The Coronal Hole Boundaries
论文作者
论文摘要
冠状孔（CHS）是具有不平衡磁通量的区域，并且与开放磁场（OMF）结构有关。但是，据报道，某些CHS不会与OMF区域相交。为了研究不一致，我们采用电势场（PF）模型来构建冠状孔的磁场。为了进行比较，我们还使用热力学磁水动力学（MHD）模型来合成冠状图像，并从合成图像中识别CHS。潜在的场CHS和合成MHD CHS的结果表明，超出CH边界的闭合线线很大一部分，而PF（MHD）CHS的50％以上（17％）不包含OMF线。在活动时间内，更可能在较低的纬度中找到边界横断线线。尽管它们的位置往往比非边界的非边界越界略接近，但在PF（MHD）CHS中，其中近40％（20％）不在边界区域。没有开放线的CHS通常比具有开放式线的CHS小且单极。 MHD模型指示沿边界横断线的温度变化较高，而不是非边界交叉线。这两个模型的结果之间的主要区别在于，PF和MHD CHS中的主要场线是封闭和开放线线的。
Coronal holes (CHs) are regions with unbalanced magnetic flux, and have been associated with open magnetic field (OMF) structures. However, it has been reported that some CHs do not intersect with OMF regions. To investigate the inconsistency, we apply a potential-field (PF) model to construct the magnetic fields of the coronal holes. As a comparison, we also use a thermodynamic magnetohydrodynamic (MHD) model to synthesize coronal images, and identify CHs from the synthetic images. The results from both the potential-field CHs and synthetic MHD CHs reveal that there is a significant percentage of closed field lines extending beyond the CH boundaries and more than 50% (17%) of PF (MHD) CHs do not contain OMF lines. The boundary-crossing field lines are more likely to be found in the lower latitudes during active times. While they tend to be located slightly closer than the non-boundary-crossing ones to the CH boundaries, nearly 40% (20%) of them in PF (MHD) CHs are not located in the boundary regions. The CHs without open field lines are often smaller and less unipolar than those with open field lines. The MHD model indicates higher temperature variations along the boundary-crossing field lines than the non-boundary crossing ones. The main difference between the results of the two models is that the dominant field lines in the PF and MHD CHs are closed and open field lines, respectively.
