YNAO OpenIR  > 太阳物理研究组
HEMISPHERIC SUNSPOT UNIT AREA: COMPARISON WITH HEMISPHERIC SUNSPOT NUMBER AND SUNSPOT AREA
Li KJ(李可军)1,2; Xiang NB(向南彬)1,3; Qu ZN(屈智宁)1,3; Xie JL(谢婧岚)1,3
Source PublicationASTRONOMICAL JOURNAL
2014-03
Volume147Issue:3Pages:1-7
DOI10.1088/0004-6256/147/3/51
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Activity Sun: General Sunspots
Abstract

The monthly mean northern and southern hemispheric sunspot numbers (SNs) and sunspot areas (SAs) in the time interval of 1945 January to 2012 December are utilized to construct the monthly northern and southern hemispheric sunspot unit areas (SUAs), which are defined as the ratio of hemispheric SA to SN. Hemispheric SUAs are usually found to rise at the beginning and to fall at the ending time of a solar cycle more rapidly, forming a more irregular cycle profile than hemispheric SNs and SAs, although it also presents Schwabe-cycle-like hemispheric SNs and SAs. Sunspot activity (SN, SA, and SUA) is found asynchronously and is asymmetrically distributed in the northern and southern hemispheres, and hemispheric SNs, SAs, and SUAs are not in phase in the two hemispheres. The similarity of hemispheric SNs and SAs is found to be much more obvious than that of hemispheric SUAs and SNs (or SAs), and also for their north-south asymmetry. A notable feature is found for the behavior of the SUA around the minimum time of cycle 24: the SUA rapidly decreases from the cycle maximum value to the cycle minimum value of sunspot cycles 19-24 within just 22 months.

Funding ProjectNational Natural Science Foundation of China[11273057] ; National Natural Science Foundation of China[11221063] ; 973 programs[2012CB957801] ; 973 programs[2011CB811406] ; Chinese Academy of Sciences
Funding OrganizationNational Natural Science Foundation of China[11273057, 11221063] ; 973 programs[2012CB957801, 2011CB811406] ; 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
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
Archive Date2014-06-23
WOS IDWOS:000331125600006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordNORTH-SOUTH ASYMMETRY ; SOLAR-ACTIVITY RECONSTRUCTION ; POLAR FACULAE ; FLARE INDEX ; R-S ; CYCLE ; VARIABILITY ; COHERENCE ; CATALOG ; SHAPE
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6256
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.Graduate School of CAS, Beijing 100863, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li KJ,Xiang NB,Qu ZN,et al. HEMISPHERIC SUNSPOT UNIT AREA: COMPARISON WITH HEMISPHERIC SUNSPOT NUMBER AND SUNSPOT AREA[J]. ASTRONOMICAL JOURNAL,2014,147(3):1-7.
APA Li KJ,Xiang NB,Qu ZN,&Xie JL.(2014).HEMISPHERIC SUNSPOT UNIT AREA: COMPARISON WITH HEMISPHERIC SUNSPOT NUMBER AND SUNSPOT AREA.ASTRONOMICAL JOURNAL,147(3),1-7.
MLA Li KJ,et al."HEMISPHERIC SUNSPOT UNIT AREA: COMPARISON WITH HEMISPHERIC SUNSPOT NUMBER AND SUNSPOT AREA".ASTRONOMICAL JOURNAL 147.3(2014):1-7.
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