Observational Study of the Three-Dimensional Magnetic Field Structure and Mass Motion in Active Regions
Observational Study of the Three-Dimensional Magnetic Field Structure and Mass Motion in Active Regions
复制标题
活动区三维磁场结构与质量运动的观测研究
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Ichimoto
中科院分区：
文献类型：
--
作者：
D. Choudhary;Y. Suematsu;K. Ichimoto
在Si i 10827.1 Å和He i 10830 Å光谱线上对活性区进行了光谱极化观测，研究了三维磁场结构和相关的等离子体流动特性。将Si i和He i磁图与势场模型进行比较，假设两条线的原点高度差约为1200 km，结果表明，很大一部分磁场与势场结构一致。Si i和He i磁图的散点图斜率分别为0.5和0.76。这些值低于Kitt峰光球磁图和色球磁图得到的散点图斜率，在这种情况下，相应的值分别为0.83和0.9。考虑到这两组色球磁图之间的高度差，这意味着磁场在过渡区高度附近扩散得更快。通过确定非对称线轮廓的质心得到的多普勒图表明，在出现通量区的情况下，色球上流区位于磁中性线区域。
Spectro-polarimetric observations of active regions were carried out in the spectral lines of Si i 10827.1 Å and He i 10830 Å to study the three-dimensional magnetic field structure and associated plasma flow properties. Comparison of Si i and He i magnetograms with the potential field model shows that a large fraction of the magnetic field is consistent with the potential field structure, by assuming that the height difference between the origin of the two lines is about 1200 km. The slope of the scatter plot between Si i and He i magnetograms is 0.5, 0.76 in an emerging flux and a larger active region, respectively. These values are lower than the scatter plot slopes obtained from Kitt Peak photospheric and chromospheric magnetograms, in which case the corresponding values are 0.83 and 0.9, respectively. Considering the height difference between these two sets of chromospheric magnetograms, this implies that the magnetic field spreads out faster near the transition region heights. Dopplergrams obtained by determining the centroid of the asymmetric line profiles show that, in case of emerging flux region, the chromospheric upflow regions are located in the magnetic neutral line areas.