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 Zhi2; Yuan Shu2; Chen Yu-Chao2; Peng Jian-Guo2; Wang Dong-Guang1; Xu Jun2; Deng Yuan-Yong1; Jin Zhen-Yu2; Ji Kai-Fan2 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2020-04-01 |
| 卷号 | 20期号:4页码:12 |
| 关键词 | techniques polarimetric techniques spectroscopic Sun magnetic fields |
| ISSN号 | 1674-4527 |
| DOI | 10.1088/1674-4527/20/4/45 |
| 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. |
| 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 |
| WOS记录号 | WOS:000529927300001 |
| 出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/55246]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Xu Zhi |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hou Jun-Feng,Xu Zhi,Yuan Shu,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 Zhi.,Yuan Shu.,Chen Yu-Chao.,Peng Jian-Guo.,...&Liu Zhong.(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：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。