克里米亚天体物理天文台Andrei B. Severny太阳塔望远镜（STT）的分光偏振计（SP）：光学设计与实现
The Spectro-Polarimeter (SP) of the Andrei B. Severny Solar Tower Telescope (STT) at the Crimean Astrophysical Observatory: Optical Design and Implementation
AI总结：
本文介绍了克里米亚天体物理天文台升级后太阳塔望远镜搭载的新型中阶梯双光束偏振时间调制分光偏振计的光学设计，以及其高分辨率、宽视场等性能与调试初步结果，为太阳低层大气研究提供新工具。
摘要：
分光偏振计（SP）是安装在克里米亚天体物理天文台升级后的Andrei B. Severny太阳塔望远镜（STT）上的一台新仪器。该仪器是传统的中阶梯光栅狭缝双光束分光偏振计，采用偏振时间调制技术。STT-SP可在光球层Fe I 5250、Fe I 5324以及色球层Mg I b2 5172三条谱线周围的三个15埃宽光谱范围内，对太阳进行同时分光偏振观测。在视宁度限制的1角秒狭缝宽度下，该仪器的光谱分辨率可达70000。STT-SP的视场为200角秒，可通过单次光栅扫描绘制中等大小活动区的图谱。该仪器将为太阳低层大气的磁场与热力学分析提供新的契机。本文介绍了STT-SP的光学设计，并展示了仪器调试期间获得的初步结果。
英文摘要：
The Spectro-Polarimeter (SP) is a new instrument installed at the upgraded Andrei B. Severny Solar Tower Telescope (STT) at the Crimean Astrophysical Observatory. The instrument is a traditional echelle slit dual-beam spectropolarimeter with temporal modulation of the polarization. STT-SP provides simultaneous spectropolarimetric observations of the Sun within three 15 Angstrom wide spectral ranges around photospheric Fe I 5250, Fe I 5324, and chromospheric Mg I b2 5172 spectral lines. The spectral resolution of the instrument reaches 70,000 with the seeing-constrained slit width of 1 arcsec. The field-of-view of STT-SP is 200 arcsec allowing one to map a moderate size active region within a single raster scan. The instrument will provide new opportunities in the analysis of magnetic fields and thermodynamics of the lower atmosphere of the Sun. In this paper we describe the optical design of STT-SP and present the preliminary results acquired during the commissioning of the instrument.
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