On the error analyses of polarization measurements of the white-light coronagraph aboard ASO-S

doi:10.1088/1674-4527/19/4/59

	On the error analyses of polarization measurements of the white-light coronagraph aboard ASO-S
	Feng, Li1 ; Li, Hui1 ; Inhester, Bernd 2; Chen, Bo 3; Ying, Bei-Li 1; Lu, Lei 1; Gan, Weiqun1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2019-04-01
卷号	19 期号:4 页码:10
关键词	Sun: corona Sun: coronal mass ejections (CMEs) techniques: polarimeter
ISSN号	1674-4527
DOI	10.1088/1674-4527/19/4/59
通讯作者	Feng, Li(lfeng@pmo.ac.cn)
英文摘要	The Advanced Space-based Solar Observatory (ASO-S) mission aims to explore the two most spectacular eruptions on the Sun: solar flares and coronal mass ejections (CMEs), and their magnetism. For the study of CMEs, the payload Lyman-alpha Solar Telescope (LST) has been proposed. It includes a traditional white-light coronagraph and a Lyman-alpha coronagraph which opens a new window to CME observations. Polarization measurements taken by white-light coronagraphs are crucial for deriving fundamental physical parameters of CMEs. To make such measurements, there are two options for a Stokes polarimeter which have been applied by existing white-light coronagraphs for space missions. One uses a single or triple linear polarizer, the other involves both a half-wave plate and a linear polarizer. We find that the former option is subject to less uncertainty in the derived Stokes vector propagating from detector noise. The latter option involves two plates which are prone to internal reflections and may have a reduced transmission factor. Therefore, the former option is adopted as our Stokes polarimeter scheme for LST. Based on the parameters of the intended linear polarizer(s) colorPol provided by CODIXX and the half-wave plate 2-APW-L2-012C by Altechna, it is further shown that the imperfect maximum transmittance of the polarizer significantly increases the variance amplification of Stokes vector by at least about 50% when compared with the ideal case. The relative errors of Stokes vector caused by the imperfection of colorPol polarizer and the uncertainty due to the polarizer assembly in the telescope are estimated to be about 5%. Among the considered parameters, we find that the dominant error comes from the uncertainty in the maximum transmittance of the polarizer.
WOS关键词	SOLAR
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:000463893700011
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/24575]
专题	中国科学院紫金山天文台
通讯作者	Feng, Li
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210034, Jiangsu, Peoples R China 2.Max Planck Inst Sonnensystemforsch, D-37077 Gottingen, Lower Saxony, Germany 3.Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Jilin, Peoples R China
推荐引用方式 GB/T 7714	Feng, Li,Li, Hui,Inhester, Bernd,et al. On the error analyses of polarization measurements of the white-light coronagraph aboard ASO-S[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(4):10.
APA	Feng, Li.,Li, Hui.,Inhester, Bernd.,Chen, Bo.,Ying, Bei-Li.,...&Gan, Weiqun.(2019).On the error analyses of polarization measurements of the white-light coronagraph aboard ASO-S.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(4),10.
MLA	Feng, Li,et al."On the error analyses of polarization measurements of the white-light coronagraph aboard ASO-S".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.4(2019):10.