论文标题
h $α$6563Å线中太阳大气的光谱极限观察
Spectropolarimetric observations of the solar atmosphere in the H$α$ 6563 Å line
论文作者
论文摘要
我们介绍了Zürich成像偏光仪（Zimpol）在Istituto Ricerche Solari locarno（IRSOL）的GregoryCoudé望远镜（IRSOL）的GregoryCoudé望远镜（IRSOL）的GregoryCoudé望远镜（IRSOL）的GregoryCoudé望远镜（IRSOL）中使用的新型光谱图。线性极化明显地由各向异性辐射的散射和Hanle效应，而Zeeman效应的圆极化。观察到的线性极化信号显示出丰富的空间变异性，其解释将打开一个新窗口，以探测太阳能球体。我们研究了它们在冠状孔内的空间变化，发现北部和南太阳能电线杆附近的$ u/i $信号的行为不同。我们确定了一些空间模式，这可能有助于对观察的解释。在具有相当大的圆极化信号的近距离区域中，我们发现类似的不对称$ Q/i c/i cropiles。我们还展示了净圆极化曲线（NCP）以及相应的线性极化信号的示例。弱场近似在观察到的圆极化信号中的应用可在靠近肢体安静（plage）区域的平均纵向场强度上的平均纵向场强度，从而使$ 10 \，$ g（$ 40-60 \，$ g）的应用。
We present novel spectropolarimetric observations of the hydrogen H$α$ line taken with the Zürich Imaging Polarimeter (ZIMPOL) at the Gregory Coudé Telescope of the Istituto Ricerche Solari Locarno (IRSOL). The linear polarization is clearly dominated by the scattering of anisotropic radiation and the Hanle effect, while the circular polarization by the Zeeman effect. The observed linear polarization signals show a rich spatial variability, the interpretation of which would open a new window for probing the solar chromosphere. We study their spatial variation within coronal holes, finding a different behaviour for the $U/I$ signals near the North and South solar poles. We identify some spatial patterns, which may facilitate the interpretation of the observations. In close-to-the-limb regions with sizable circular polarization signals we find similar asymmetric $Q/I$ profiles. We also show examples of net circular polarization profiles (NCP), along with the corresponding linear polarization signals. The application of the weak field approximation to the observed circular polarization signals gives $10\,$G ($40-60\,$G) in close to the limb quiet (plage) regions for the average longitudinal field strength over the spatio-temporal resolution element.
