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Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope
Cai YF(蔡云芳)1,2; Xu Z(徐稚)1; Chen YC(陈宇超)1,2; Xu J(许骏)1; Li ZG(李正刚)1; Fu Y(付玉)1; Ji KF(季凯帆)1; Xu Z(徐稚), Email: xuzhi@ynao.ac.cn
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-04-01
卷号18期号:4
DOI10.1088/1674-4527/18/4/42
产权排序第1完成单位
收录类别SCI
关键词Instrumentation: Spectrographs Sun: Sunspots Techniques: Imaging Spectroscopy Techniques: Image Processing
摘要In this paper we illustrate the technique used by the New Vacuum Solar Telescope (NVST) to increase the spatial resolution of two-dimensional (2D) solar spectroscopy observations involving two dimensions of space and one of wavelength. Without an image stabilizer at the NVST, large scale wobble motion is present during the spatial scanning, whose instantaneous amplitude can reach 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 scanned 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 H alpha 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 sampling 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. A physical quantity, such as the line-of-sight velocities in multiple layers of the solar atmosphere, is also inferred from the re-arranged spectrum, demonstrating the advantage of this technique.
项目资助者National Natural Science Foundation of China(11773072, 11573012, 11473064)
语种英语
学科领域天文学
文章类型Article
ISSN1674-4527
URL查看原文
WOS记录号WOS:000430282700006
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]HIGH-SPATIAL-RESOLUTION ; CORRELATION TRACKER ; SPECTROSCOPY ; RECONSTRUCTION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12305
专题抚仙湖太阳观测站
通讯作者Xu Z(徐稚), Email: xuzhi@ynao.ac.cn
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
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GB/T 7714
Cai YF,Xu Z,Chen YC,et al. Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(4).
APA Cai YF.,Xu Z.,Chen YC.,Xu J.,Li ZG.,...&Xu Z.(2018).Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(4).
MLA Cai YF,et al."Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.4(2018).
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