用GRIS-IFU探测宁静太阳中的磁环和蛇形场
Exploring magnetic loops and serpentine fields in the quiet Sun with the GRIS-IFU
摘要：
从辐射磁流体力学模拟产生的合成观测预测，在安静的太阳光球更高的偏振分数将通过增加总积分时间的观测在GREGOR分辨率。我们目前最近获得的磁盘中心的Fe I $15648.5$ $\mathrmÅ$行获得的GREGOR望远镜配备GRIS-IFU在良好的看到的条件下，表现出非常高的偏振分数。我们的观察揭示了一个互联网络区域与大多数（$>60\%$）的磁化像素显示一个明确的横向分量的磁场。这一结果与先前在这条谱线上对盘中心GRIS-IFU的观测形成鲜明对比，后者在深光球层中主要具有垂直磁场。同时，中值磁场强度弱于先前GRIS-IFU观察结果，表明更大比例的极化信号不能用更活跃的靶点来解释。我们使用的斯托克斯反演响应函数（SIR）代码的基础上分析的数据，执行超过$45$百万反演，并询问的影响，两个相互冲突的方法来处理噪声的检索的磁倾角和方位角。我们提出了几个案例研究的动物园的磁性功能存在于这些数据中，包括小规模的磁回路，似乎是嵌入在一个海洋的磁性，和蜿蜒的领域，专注于全矢量光谱偏振已实现的地区。我们还提出了一个新的开源Python 3分析工具，SIR Explorer（SIRE），我们用它来研究这些小尺度磁特征的动态。
英文摘要：
Synthetic observations produced from radiative magnetohydronamic simulations have predicted that higher polarization fractions in the quiet solar photosphere would be revealed by increasing the total integration time of observations at GREGOR resolutions. We present recently acquired disk centre observations of the Fe I $15648.5$ $\mathrmÅ$ line obtained with the GREGOR telescope equipped with the GRIS-IFU during excellent seeing conditions, showing exceptionally high polarization fractions. Our observation reveal an internetwork region with a majority ($>60\%$) of magnetised pixels displaying a clear transverse component of the magnetic field. This result is in stark contrast to previous disk-centre GRIS-IFU observations in this spectral line, which had predominantly vertical magnetic fields in the deep photosphere. At the same time, the median magnetic field strength is weaker than previous GRIS-IFU observations, indicating that the larger fraction of polarization signals cannot be explained by a more active target. We use the Stokes Inversion based on Response functions (SIR) code to analyse the data, performing over $45$ million inversions, and interrogate the impact of two conflicting approaches to the treatment of noise on the retrieval of the magnetic inclination and azimuth. We present several case studies of the zoo of magnetic features present in these data, including small-scale magnetic loops that seem to be embedded in a sea of magnetism, and serpentine fields, focusing on regions where full-vector spectropolarimetry has been achieved. We also present a new open-source Python 3 analysis tool, SIR Explorer (SIRE), that we use to examine the dynamics of these small-scale magnetic features.
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