Phase relations between total solar irradiance and the Mg II index

	Phase relations between total solar irradiance and the Mg II index
	Li, K. J.1,2; Xu, J. C.1,3; Xiang, N. B.1,3; Feng, W.4,5
刊名	ADVANCES IN SPACE RESEARCH
	2016
卷号	57 期号:1 页码:408-417
关键词	Sun: general Sun: activity Sun: chromosphere
英文摘要	The Mg II index is usually used to represent the brightening contribution to total solar irradiance (TSI) by solar bright structures, such as faculae and network. In order to understand variations of TSI, phase relations of TSI and the chromospheric Mg II index is investigated on time-scales of one year and longer. The NOAA daily Mg II index at the time interval of November 17, 1978 October 24, 2007 is utilized to carry out correlation analyses respectively with the daily ACRIM and PMOD composites of TSI. The Mg II index is found to lead TSI by about one solar rotation period for time-scales of one year and longer. Correlation of TSI with the Mg II index on the time-scale of one year is sometimes significantly positive, sometimes statistically insignificant, and sometimes even significantly negative. When sunspot darkening is dominant, the correlation between TSI and Mg II is either negative or not significant. When TSI is backward shifted vs the Mg II index by about one rotation period, correlation between them becomes significantly positive in all years. Thus, it is after about one rotation period that a more prominent intensification is inferred to be contributed to TSI than that immediately, by bright constructions, which is represented by the Mg II index. We propose an explanation for the phase relationship of TSI and the Mg II index. (C) 2015 COSPAR. Published by Elsevier Ltd. All rights reserved.
收录类别	SCI
语种	英语
WOS记录号	WOS:000368564300033
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5451]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Kunming Univ Sci & Technol, Res Ctr Anal & Measurement, Kunming 650093, Peoples R China 5.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Li, K. J.,Xu, J. C.,Xiang, N. B.,et al. Phase relations between total solar irradiance and the Mg II index[J]. ADVANCES IN SPACE RESEARCH,2016,57(1):408-417.
APA	Li, K. J.,Xu, J. C.,Xiang, N. B.,&Feng, W..(2016).Phase relations between total solar irradiance and the Mg II index.ADVANCES IN SPACE RESEARCH,57(1),408-417.
MLA	Li, K. J.,et al."Phase relations between total solar irradiance and the Mg II index".ADVANCES IN SPACE RESEARCH 57.1(2016):408-417.