新型真空太阳望远镜二维扫描光谱的合成方法
Composing Method for the Two-dimensional Scanning Spectra Observed by the New Vacuum Solar Telescope
摘要：
本文阐述了新真空太阳望远镜提高二维太阳光谱观测的空间分辨率的技术，包括二维空间和一维波长。由于NVST没有像稳器，在空间扫描过程中会出现大尺度的抖动，由于地球大气和望远镜导引系统的精度，抖动的瞬时幅度可达1.3”，严重降低了由扫描光谱组成的二维空间图的空间分辨率。我们做出以下努力来解决这个问题：成像系统（例如，TiO波段）用于记录和检测光栅扫描期间太阳像运动在狭缝和扫描方向上的位移矢量。光谱数据（例如，根据这些位移矢量，在空间上校正和重新排列最初在时间序列上获得Ha线）。光栅扫描在具有不同视宁度条件的几个活动区域中进行（本文举例说明了两个光栅）。给定一定的空间采样和时间分辨率，合成的2D图的空间分辨率可以接近于裂隙颌图像的空间分辨率。用两种方法对校正后的质量进行了定量评价。二维物理量，如太阳大气层中的多层视线速度，也被推断证明这种技术的效果。
英文摘要：
In this paper we illustrate the technique used by the New Vacuum Solar Telescope to increase the spatial resolution of two-dimensional (2D) solar spectroscopy observation involving two dimensions of space and one of wavelength. Without an image stabilizer at the NVST, a large scale wobble motion is present during the spatial scanning, whose instantaneous amplitude could reach up to 1.3" due to the earth's atmosphere and the precision of the telescope guiding system, and seriously decreases the spatial resolution of 2D spatial maps composed with the scanning spectra. We make the following effort to resolve this problem: the imaging system (e.g., the TiO-band) is used to record and detect the displacement vectors of solar image motion during the raster scan, in both the slit and scanning directions. The spectral data (e.g., the Ha line) which are originally obtained in time sequence are corrected and re-arranged in space according to those displacement vectors. Raster scans are carried out in several active regions with different seeing conditions (two rasters are illustrated in this paper). Given a certain spatial sample and temporal resolution, the spatial resolution of the composed 2D map could be close to that of the slit-jaw image. The resulting quality after correction is quantitatively evaluated with two methods. Two-dimensional physical quantity, such as the line-of-sight velocities in multi-layer of the solar atmosphere, is also inferred demonstrating the effect of this technique.
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