Klaus G. Strassmeier, Ilya Ilyin, Manfred Woche, Frank Dionies, Michael Weber, Arto Järvinen, Carsten Denker, Ekaterina Dineva, Meetu Verma, Thomas Granzer, Wilbert Bittner, Svend-Marian Bauer, Jens Paschke, Hakan Önel
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引用次数: 0
摘要
由 SDI-POL 拍摄的太阳作为恒星的第一光光谱，SDI-POL 是太阳盘面积分光度计，为 LBT 的 PEPSI 夜用光谱仪提供能量。上图显示了 SDI-POL 覆盖的整个波长范围（383 - 907 nm）。斯托克斯 I光谱的颜色表示各个交叉色散器；从深蓝色（=CD 1）到深红色（=CD 6）。底图是钠 D 线附近光谱区域的放大图。上面的光谱也是斯托克斯 I 波段（每个 CCD 像素上的点用一条线连接），下面的光谱是斯托克斯 V Q U 波段，强度偏移了-0.10，相对于斯托克斯 I 波段的比例扩大了 200 倍。I Q U 波段拍摄于 2022 年 5 月 20 日UT，V 波段拍摄于 2023 年 6 月 22 日UT。第一光应用探测到了清晰的斯托克斯 V/I 曲线，表明 2023 年 10 月 13 日太阳盘平均视线净磁场为 +0.37±0.02 Gauß，虽然微小，但意义重大，正如 Strassmeier 等人的文章（本期，e240033）所报道的那样。
First-light spectra of the Sun as a star taken by SDI-POL, the Solar Disk Integration POLarimeter feeding the PEPSI night-time spectrograph at the LBT. The top panel shows the full wavelength range (383 - 907 nm) covered by SDI-POL. The color of the Stokes I spectra indicates the individual cross dispersers; dark blue (=CD 1) to dark red (=CD 6). The line at the bottom represents the normalized Stokes V Q & U signal on the same intensity scale as Stokes I. The bottom panel is a zoom into the spectral region around the sodium D lines. The top spectrum is again Stokes I (plotted are dots per CCD pixel connected by a line), the bottom spectra are Stokes V Q U shifted by -0.10 in intensity and expanded by a factor 200 in scale with respect to Stokes I. The I Q U spectrum was taken on UT May 20, 2022, the V-spectrum on UT June 22, 2023. The first-light application detects a clear Stokes V/I profile indicative of a tiny but significant solar disk-averaged line-of-sight net magnetic field of +0.37±0.02 Gauß on Oct. 13, 2023, as reported in the article by Strassmeier et al., this issue, e240033.
期刊介绍：
Astronomische Nachrichten, founded in 1821 by H. C. Schumacher, is the oldest astronomical journal worldwide still being published. Famous astronomical discoveries and important papers on astronomy and astrophysics published in more than 300 volumes of the journal give an outstanding representation of the progress of astronomical research over the last 180 years. Today, Astronomical Notes/ Astronomische Nachrichten publishes articles in the field of observational and theoretical astrophysics and related topics in solar-system and solar physics. Additional, papers on astronomical instrumentation ground-based and space-based as well as papers about numerical astrophysical techniques and supercomputer modelling are covered. Papers can be completed by short video sequences in the electronic version. Astronomical Notes/ Astronomische Nachrichten also publishes special issues of meeting proceedings.
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