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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
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-04-01
Volume18Issue:4
DOI10.1088/1674-4527/18/4/42
Contribution Rank第1完成单位
Indexed BySCI
KeywordInstrumentation: Spectrographs Sun: Sunspots Techniques: Imaging Spectroscopy Techniques: Image Processing
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[11773072] ; National Natural Science Foundation of China[11573012] ; National Natural Science Foundation of China[11473064]
Funding OrganizationNational Natural Science Foundation of China[11773072, 11573012, 11473064]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000430282700006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordHIGH-SPATIAL-RESOLUTION ; CORRELATION TRACKER ; SPECTROSCOPY ; RECONSTRUCTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12305
Collection抚仙湖太阳观测站
Corresponding AuthorXu Z(徐稚)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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).
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