SOLIS/VSM全磁盘矢量磁图有效区自动识别与方位消歧
Automatic Active-Region Identification and Azimuth Disambiguation of the SOLIS/VSM Full-Disk Vector Magnetograms
摘要：
国家统计局太阳光学长期观测设施的矢量分光磁仪现已投入使用，并首次获得了整个可见太阳半球的矢量磁场测量数据。然而，要充分利用前所未有的SOLIS/VSM数据，必须首先解决两个关键问题：首先，太阳活动区的研究需要一个自动的，物理直观的，在太阳活动区识别技术。第二，使用活动区矢量磁图需要消除方位角$180^o$ -横向磁场分量方向的模糊性。在这里，我们报告的努力，同时有效地解决这两个问题。为了识别太阳活动区，我们采用一种算法，旨在定位复杂的，磁通量平衡，磁结构与占主导地位的E-W方向的磁盘上。此后，提取对应于活动区域的每个盘部分，并对其进行非势磁场计算（NPFC）方法，该方法提供180度模糊度的物理直观解。这两种算法都已集成到VSM数据管道中，并实时运行，无需人工干预。我们的结论是，这种结合的方法可以有意义地促进我们的新兴能力，为全磁盘矢量磁作为SOLIS今天开创的，并将在未来进行地面和星载magnetographs。
英文摘要：
The Vector Spectromagnetograph (VSM) of the NSO's Synoptic Optical Long-Term Investigations of the Sun (SOLIS) facility is now operational and obtains the first-ever vector magnetic field measurements of the entire visible solar hemisphere. To fully exploit the unprecedented SOLIS/VSM data, however, one must first address two critical problems: first, the study of solar active regions requires an automatic, physically intuitive, technique for active-region identification in the solar disk. Second, use of active-region vector magnetograms requires removal of the azimuthal $180^o$-ambiguity in the orientation of the transverse magnetic field component. Here we report on an effort to address both problems simultaneously and efficiently. To identify solar active regions we apply an algorithm designed to locate complex, flux-balanced, magnetic structures with a dominant E-W orientation on the disk. Each of the disk portions corresponding to active regions is thereafter extracted and subjected to the Nonpotential Magnetic Field Calculation (NPFC) method that provides a physically-intuitive solution of the 180-degree ambiguity. Both algorithms have been integrated into the VSM data pipeline and operate in real time, without human intervention. We conclude that this combined approach can contribute meaningfully to our emerging capability for full-disk vector magnetography as pioneered by SOLIS today and will be carried out by ground-based and space-borne magnetographs in the future.
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