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Spectro-polarimetric observations at the NVST: I. instrumental polarization calibration and primary measurements
Hou Jun-Feng1; Xu Z(徐稚)2; Yuan S(袁沭)2; Chen YC(陈宇超)2; Peng JG(彭建国)2; Wang Dong-Guang1; Xu J(许骏)2; Deng Yuan-Yong1; Jin ZY(金振宇)2; Ji KF(季凯帆)2; Liu Z(刘忠)2
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2020-04-01
Volume20Issue:4Pages:12
DOI10.1088/1674-4527/20/4/45
Contribution Rank第2完成单位
Indexed BySCI ; CSCD
Keywordtechniques polarimetric techniques spectroscopic Sun magnetic fields
Abstract

This paper is devoted to the primary spectro-polarimetric observation performed at the New Vacuum Solar Telescope (NVST) of China since 2017, and our aim is to precisely evaluate the real polarimetric accuracy and sensitivity of this polarimetry by using full Stokes spectro-polarimetric observations of the photospheric line Fe I 532.4 nm. In the work, we briefly describe the salient characteristic of the NVST as a polarimeter in terms of technology and then characterize its instrumental polarization based on the operation in 2017 and 2019. It is verified that the calibration method utilizing the instrumental polarization calibration unit (ICU) is stable and credible. The calibration accuracy can reach up to 3 x 10(-3). Based on the scientific observation of NOAA Active Region 12645 on 2017 April 5, we estimate that the residual cross-talk from Stokes I to Stokes Q, U and V, after the instrumental polarization calibration, is about 4 x 10(-3) on average, which is consistent with the calibration accuracy and close to the photon noise. The polarimetric sensitivity (i.e., the detection limit) for polarized light is of the order of 10(-3) with an integration time over 20 s. Slow modulation rate is indeed an issue for the present system. The present NVST polarimeter is expected to be integrated with a high-order adaptive optics system and a field scanner to realize 2D vector magnetic field measurements in the following instrumentation update.

Funding ProjectNational Natural Science Foundation of China[11873091] ; National Natural Science Foundation of China[11773040] ; National Natural Science Foundation of China[11773072] ; National Natural Science Foundation of China[11373044]
Funding OrganizationNational Natural Science Foundation of China[11873091, 11773040, 11773072, 11373044]
Language英语
Subject Area天文学 ; 天体物理学 ; 实测天体物理学 ; 太阳与太阳系 ; 太阳与太阳系其他学科
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:000529927300001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSOLAR TELESCOPE ; VECTOR
CSCD IDCSCD:6721347
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/23179
Collection抚仙湖太阳观测站
Corresponding AuthorXu Z(徐稚)
Affiliation1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Hou Jun-Feng,Xu Z,Yuan S,et al. Spectro-polarimetric observations at the NVST: I. instrumental polarization calibration and primary measurements[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(4):12.
APA Hou Jun-Feng.,Xu Z.,Yuan S.,Chen YC.,Peng JG.,...&Liu Z.(2020).Spectro-polarimetric observations at the NVST: I. instrumental polarization calibration and primary measurements.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(4),12.
MLA Hou Jun-Feng,et al."Spectro-polarimetric observations at the NVST: I. instrumental polarization calibration and primary measurements".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.4(2020):12.
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