GREGOR法布里-珀罗干涉仪及其配套的蓝色成像太阳光谱仪
The GREGOR Fabry-Pérot Interferometer and its companion the Blue Imaging Solar Spectrometer
摘要：
法布里-珀罗干涉仪（GFPI）是位于西班牙特内里费岛泰德天文台的德国1.5米口径的格雷戈里太阳望远镜的三个第一个光仪器之一。GFPI允许快速窄带成像和事后图像恢复。检索到的物理参数将是了解太阳表面上低至约50公里空间尺度的动态太阳及其磁场的基本组成部分。GFPI是一种可调双标准具系统，采用准直安装。它设计用于光谱和分光偏振观测，分别在530-860 nm和580-660 nm之间，并具有约250，000的理论光谱分辨率R。大幅面、高节奏CCD探测器，配备先进的计算机硬件和软件，能够在相当于太阳特征演变时间的时间跨度内扫描谱线。50”x 38”的视场（FOV）覆盖了光谱模式下有源区典型面积的很大一部分。在斯托克斯矢量分光偏振法的情况下，FOV减小到25”x 38”。我们提出的GFPI的主要特点，包括先进的和自动化的校准和观测程序。我们讨论的仪器的光学设计的改进，并显示第一个观测结果。最后，我们提出了第一个具体的想法，整合第二个FPI，蓝色成像太阳光谱仪（BLISS），它将探索530 nm以下的蓝色光谱区域。
英文摘要：
The GREGOR Fabry-Pérot Interferometer (GFPI) is one of three first-light instruments of the German 1.5-meter GREGOR solar telescope at the Observatorio del Teide, Tenerife, Spain. The GFPI allows fast narrow-band imaging and post-factum image restoration. The retrieved physical parameters will be a fundamental building block for understanding the dynamic Sun and its magnetic field at spatial scales down to about 50 km on the solar surface. The GFPI is a tunable dual-etalon system in a collimated mounting. It is designed for spectrometric and spectropolarimetric observations between 530-860 nm and 580-660 nm, respectively, and possesses a theoretical spectral resolution R of about 250,000. Large-format, high-cadence CCD detectors with sophisticated computer hard- and software enable the scanning of spectral lines in time-spans equivalent to the evolution time of solar features. The field-of-view (FOV) of 50" x 38" covers a significant fraction of the typical area of active regions in the spectroscopic mode. In case of Stokes-vector spectropolarimetry, the FOV reduces to 25" x 38". We present the main characteristics of the GFPI including advanced and automated calibration and observing procedures. We discuss improvements in the optical design of the instrument and show first observational results. Finally, we lay out first concrete ideas for the integration of a second FPI, the Blue Imaging Solar Spectrometer (BLISS), which will explore the blue spectral region below 530 nm.
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