Method of composing two-dimensional scanned spectra observed by the New Vacuum Solar Telescope
文献类型:期刊论文
作者 | 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 |
刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS |
出版日期 | 2018-04-01 |
卷号 | 18期号:4 |
ISSN号 | 1674-4527 |
关键词 | Instrumentation: Spectrographs Sun: Sunspots Techniques: Imaging Spectroscopy Techniques: Image Processing |
DOI | 10.1088/1674-4527/18/4/42 |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | 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. |
学科主题 | 天文学 |
URL标识 | 查看原文 |
出版地 | 20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA |
WOS关键词 | HIGH-SPATIAL-RESOLUTION ; CORRELATION TRACKER ; SPECTROSCOPY ; RECONSTRUCTION |
资助项目 | National Natural Science Foundation of China[11773072] ; National Natural Science Foundation of China[11573012] ; National Natural Science Foundation of China[11473064] |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
WOS记录号 | WOS:000430282700006 |
资助机构 | National Natural Science Foundation of China[11773072, 11573012, 11473064] |
源URL | [http://ir.ynao.ac.cn/handle/114a53/12305] |
专题 | 云南天文台_抚仙湖太阳观测站 天文技术实验室 |
通讯作者 | Xu Z(徐稚) |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China 2.University of Chinese Academy of Sciences, Beijing 100049, China |
推荐引用方式 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.,...&Ji KF.(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). |
入库方式: OAI收割
来源:云南天文台
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