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What do the solar activity indices represent?
Li KJ(李可军)1,2; Kong DF(孔德芳)1,3; Liang, HF4; Feng, W5
Source PublicationASTRONOMISCHE NACHRICHTEN
2014-05
Volume335Issue:4Pages:371-377
DOI10.1002/asna.201312016
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Activity Sun: General Sun: Radio Radiation Sunspots
Abstract

Sunspot number, sunspot area, and radio flux at 10.7 cm are the indices which are most frequently used to describe the long-term solar activity. The data of the daily solar full-disk magnetograms measured at Mount Wilson Observatory from 19 January 1970 to 31 December 2012 are utilized together with the daily observations of the three indices to probe the relationship of the full-disk magnetic activity respectively with the indices. Cross correlation analyses of the daily magnetic field measurements at Mount Wilson observatory are taken with the daily observations of the three indices, and the statistical significance of the difference of the obtained correlation coefficients is investigated. The following results are obtained: (1) The sunspot number should be preferred to represent/reflect the full-disk magnetic activity of the Sun to which the weak magnetic fields (outside of sunspots) mainly contribute, the sunspot area should be recommended to represent the strong magnetic activity of the Sun (in sunspots), and the 10.7 cm radio flux should be preferred to represent the full-disk magnetic activity of the Sun (both the weak and strong magnetic fields) to which the weak magnetic fields mainly contribute. (2) On the other hand, the most recommendable index that could be used to represent/reflect the weak magnetic activity is the 10.7 cm radio flux, the most recommendable index that could be used to represent the strong magnetic activity is the sunspot area, and the most recommendable index that could be used to represent the full-disk magnetic activity of the Sun is the 10.7cm radio flux. Additionally, the cycle characteristics of the magnetic field strengths on the solar disk are given. ((c) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Funding ProjectNASA ; ONR ; NSF under Mount Wilson Institute ; 973 programs[2012CB957801] ; 973 programs[2011CB811406] ; National Natural Science Foundation of China[11273057] ; National Natural Science Foundation of China[11221063] ; Chinese Academy of Sciences
Funding OrganizationNASA ; ONR ; NSF under Mount Wilson Institute ; 973 programs[2012CB957801, 2011CB811406] ; National Natural Science Foundation of China[11273057, 11221063] ; Chinese Academy of Sciences
Language英语
Subject Area天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherWILEY-V C H VERLAG GMBH
Publication PlacePOSTFACH 101161, 69451 WEINHEIM, GERMANY
ISSN0004-6337
URL查看原文
Archive Date2014-06-23
WOS IDWOS:000335665600005
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGROUP SUNSPOT NUMBERS ; POLAR FACULAE ; MOUNT-WILSON ; ACTIVITY RECONSTRUCTION ; CYCLE ; ROTATION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6252
Collection太阳物理研究组
Corresponding AuthorLi KJ(李可军)
Affiliation1.National Astronomical Observatories/Yunnan Observatory, CAS, Kunming 650011, China
2.Key Laboratory of Solar Activity, National Astronomical Observatories, CAS, Beijing 100012, China
3.University of Chinese Academy of Sciences, Beijing 100863, China
4.Department of Physics, Yunnan Normal University, Kunming 650093, China
5.Research Center of Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li KJ,Kong DF,Liang, HF,et al. What do the solar activity indices represent?[J]. ASTRONOMISCHE NACHRICHTEN,2014,335(4):371-377.
APA Li KJ,Kong DF,Liang, HF,&Feng, W.(2014).What do the solar activity indices represent?.ASTRONOMISCHE NACHRICHTEN,335(4),371-377.
MLA Li KJ,et al."What do the solar activity indices represent?".ASTRONOMISCHE NACHRICHTEN 335.4(2014):371-377.
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