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 |
DOI | 10.1088/1674-4527/20/4/45 |
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. |
入库方式: OAI收割
来源:云南天文台
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