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arXiv 2201.03815astro-ph.SR
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在H $α$ 6563谱线上太阳大气的分光偏振观测

Spectropolarimetric observations of the solar atmosphere in the H$α$ 6563 Å line

J. Jaume Bestard, J. Trujillo Bueno, M. Bianda, J. Štěpán, R. Ramelli

摘要:

我们提出了新的光谱偏振观测的氢H $α$线与苏黎世成像偏振仪(ZIMPOL)在格雷戈里库德望远镜的Istituto Ricerche Solari洛迦诺(IRSOL)。线偏振明显地由各向异性辐射的散射和Hanle效应主导,而圆偏振由塞曼效应主导。观测到的线偏振信号显示出丰富的空间变异性,这将为探测太阳色球层打开一个新的窗口。我们研究了它们在日冕洞内的空间变化,发现太阳南北两极附近的$U/I$信号有不同的行为。我们确定了一些空间模式,这可能有助于解释的意见。在接近的肢体地区与相当大的圆偏振信号,我们发现类似的不对称$Q/I$的配置文件。我们还显示了净圆偏振剖面(NCP)的例子,以及相应的线偏振信号。弱场近似的应用程序所观察到的圆偏振信号给出$10\,$ G($40-60\,$ G)在接近临边安静(plage)地区的平均纵向场强超过时空分辨率元素。

英文摘要:

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.

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