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The Formation of a Sunspot Penumbra Sector in Active Region NOAA 12574
Li QL(李巧玲)1,2; Yan XL(闫晓理)1,3; Wang JC(王金成)1,2; Kong DF(孔德芳)1,3; Xue ZK(薛志科)1,3; Yang LH(杨丽恒)1,3; Cao, Wenda4
Source PublicationASTROPHYSICAL JOURNAL
2018-04-10
Volume857Issue:1
DOI10.3847/1538-4357/aab6b0
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Granulation Sun: Magnetic Fields Sun: Photosphere Sunspots
Abstract

We present a particular case of the formation of a penumbra sector around a developing sunspot in the active region NOAA 12574 on 2016 August 11 by using the high-resolution data observed by the New Solar Telescope at the Big Bear Solar Observatory and the data acquired by the Helioseismic and Magnetic Imager and the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory satellite. Before the new penumbra sector formed, the developing sunspot already had two umbrae with some penumbral filaments. The penumbra sector gradually formed at the junction of two umbrae. We found that the formation of the penumbra sector can be divided into two stages. First, during the initial stage of penumbral formation, the region where the penumbra sector formed always appeared blueshifted in a Dopplergram. The area, mean transverse magnetic field strength, and total magnetic flux of the umbra and penumbra sector all increased with time. The initial penumbral formation was associated with magnetic emergence. Second, when the penumbra sector appeared, the magnetic flux and area of the penumbra sector increased after the umbra's magnetic flux and area decreased. These results indicate that the umbra provided magnetic flux for penumbral development after the penumbra sector appeared. We also found that the newly formed penumbra sector was associated with sunspot rotation. Based on these findings, we suggest that the penumbra sector was the result of the emerging flux that was trapped in the photosphere at the initial stage of penumbral formation, and when the rudimentary penumbra formed, the penumbra sector developed at the cost of the umbra.

Funding ProjectNational Science Foundation of China (NSFC)[11373066] ; National Science Foundation of China (NSFC)[11603071] ; National Science Foundation of China (NSFC)[11503080] ; National Science Foundation of China (NSFC)[11573012] ; National Science Foundation of China (NSFC)[11633008] ; Youth Innovation Promotion Association CAS[2011056] ; NJIT ; US NSF[AGS-1250818] ; NASA[NNX13AG14G] ; Korea Astronomy and Space Science Institute ; Seoul National University ; strategic priority research program of CAS[XDB09000000]
Funding OrganizationNational Science Foundation of China (NSFC)[11373066, 11603071, 11503080, 11573012, 11633008] ; Youth Innovation Promotion Association CAS[2011056] ; NJIT ; US NSF[AGS-1250818] ; NASA[NNX13AG14G] ; Korea Astronomy and Space Science Institute ; Seoul National University ; strategic priority research program of CAS[XDB09000000]
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
ISSN0004-637X
URL查看原文
WOS IDWOS:000429729200001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordLOCAL CORRELATION TRACKING ; MAGNETIC-FIELD ; FINE-STRUCTURE ; PORES ; FLUX ; INCLINATION ; ORIGIN
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12212
Collection抚仙湖太阳观测站
Corresponding AuthorLi QL(李巧玲)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
2.University of Chinese Academy of Sciences, Yuquan Road, Shijingshan Block Beijing 100049, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China
4.Big Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314, USA
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li QL,Yan XL,Wang JC,et al. The Formation of a Sunspot Penumbra Sector in Active Region NOAA 12574[J]. ASTROPHYSICAL JOURNAL,2018,857(1).
APA Li QL.,Yan XL.,Wang JC.,Kong DF.,Xue ZK.,...&Cao, Wenda.(2018).The Formation of a Sunspot Penumbra Sector in Active Region NOAA 12574.ASTROPHYSICAL JOURNAL,857(1).
MLA Li QL,et al."The Formation of a Sunspot Penumbra Sector in Active Region NOAA 12574".ASTROPHYSICAL JOURNAL 857.1(2018).
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