中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Spectro-polarimetric observations at the NVST: I. instrumental polarization calibration and primary measurements

文献类型:期刊论文

作者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
刊名RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期2020-04-01
卷号20期号:4页码:12
ISSN号1674-4527
关键词techniques polarimetric techniques spectroscopic Sun magnetic fields
DOI10.1088/1674-4527/20/4/45
产权排序第2完成单位
文献子类Article
英文摘要

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.

学科主题天文学 ; 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
URL标识查看原文
出版地20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
WOS关键词SOLAR TELESCOPE ; VECTOR
资助项目National 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]
WOS研究方向Astronomy & Astrophysics
语种英语
CSCD记录号CSCD:6721347
出版者NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号WOS:000529927300001
资助机构National Natural Science Foundation of China[11873091, 11773040, 11773072, 11373044]
源URL[http://ir.ynao.ac.cn/handle/114a53/23178]  
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.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
推荐引用方式
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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来源:云南天文台

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