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Naked emergence of an anti-Hale active region I. Overall evolution and magnetic properties
Wang JC(王金成)1,2,3; Yan XL(闫晓理)1,3; Kong DF(孔德芳)1,3; Xue ZK(薛志科)1,3; Yang LH(杨丽恒)1,3; Li QL(李巧玲)1,4; Zhang Y(张岩)1,4; Li, Hao5,6
Source PublicationASTRONOMY & ASTROPHYSICS
2021-08-11
Volume652
DOI10.1051/0004-6361/202140685
Contribution Rank第1完成单位
Indexed BySCI ; EI
Keywordsunspots Sun: evolution Sun: magnetic fields
Abstract

Aims. In order to understand the emergence of the active region, we investigate the emerging process and magnetic properties of a naked anti-Hale active region during the period between August 24 to 25, 2018. Methods. Using the data from Helioseismic and Magnetic Imager on board the Soar Dynamic Observatory and the New Vacuum Solar Telescope, we calculated different evolving parameters (such as pole separation, tilt angle) and magnetic parameters (such as vertical electric current, force-free parameter, relative magnetic helicity) during the emergence of the active region. With these calculated parameters and some reasonable assumptions, we use two different methods to estimate the twist of the active region. Results. The magnetic flux and pole separation continue increasing while the tilt angle exhibits a decreasing pattern during the emergence of the active region. The increase of the pole separation is mainly contributed as a result of the enhancement in the longitude direction. A power-law relationship between pole separation and total flux is found during the emergence of the active region. On the other hand, it is found that both the positive and negative electric currents increased equivalently and the average flux-weighted force-free parameter (alpha) over tilde remains almost consistently positive, on the order of similar to 10(-8) m(-1). The relative magnetic helicity is mainly contributed by the shear term, while the relative magnetic helicity injection flux of the shear term changes its sign at the latter stage of the emergence. The twist number of the whole active region remains on the order of 10(-1) turns during the emergence of the active region. Conclusions. We find that the magnetic flux tube with low twist also could emerge into the solar atmosphere.

Funding ProjectNational Key R&D Program of China[2019YFA0405000] ; National Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[12003064] ; National Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[11873087] ; National Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[11803085] ; Yunnan Science Foundation of China[2019FD085] ; CAS Light of West China Program[Y9XB018001] ; Open Research Program of the Key Laboratory of Solar Activity of Chinese Academy of Sciences[KLSA202014] ; Yunnan Talent Science Foundation of China[2018FA001] ; Yunnan Science Foundation for Distinguished Young Scholars[202001AV070004] ; Key Research and Development Project of Yunnan Province[202003AD150019]
Funding OrganizationNational Key R&D Program of China[2019YFA0405000] ; National Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[12003064, 11873087, 11803085] ; Yunnan Science Foundation of China[2019FD085] ; CAS Light of West China Program[Y9XB018001] ; Open Research Program of the Key Laboratory of Solar Activity of Chinese Academy of Sciences[KLSA202014] ; Yunnan Talent Science Foundation of China[2018FA001] ; Yunnan Science Foundation for Distinguished Young Scholars[202001AV070004] ; Key Research and Development Project of Yunnan Province[202003AD150019]
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
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000683963000003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordELECTRIC-CURRENT NEUTRALIZATION ; FLUX-TUBE EMERGENCE ; CURRENT PATTERNS ; HELICITY ; FIELD ; ENERGY ; TWIST ; INJECTION ; TRANSPORT ; TILT
EI Accession Number20213410792831
EI KeywordsSeparation
EI Classification Number701.2 Magnetism: Basic Concepts and Phenomena - 802.3 Chemical Operations
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ynao.ac.cn/handle/114a53/24525
Collection抚仙湖太阳观测和研究基地
Corresponding AuthorWang JC(王金成)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming Yunnan 650216, PR China;
2.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, PR China;
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, PR China;
4.University of Chinese Academy of Sciences, Yuquan Road, Shijingshan Block, Beijing 100049, PR China;
5.Instituto de Astrofisica de Canarias, 38205 La Laguna, Tenerife, Spain;
6.Universidad de La Laguna, Dpto. Astrofisica, 38206 La Laguna, Tenerife, Spain
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang JC,Yan XL,Kong DF,et al. Naked emergence of an anti-Hale active region I. Overall evolution and magnetic properties[J]. ASTRONOMY & ASTROPHYSICS,2021,652.
APA Wang JC.,Yan XL.,Kong DF.,Xue ZK.,Yang LH.,...&Li, Hao.(2021).Naked emergence of an anti-Hale active region I. Overall evolution and magnetic properties.ASTRONOMY & ASTROPHYSICS,652.
MLA Wang JC,et al."Naked emergence of an anti-Hale active region I. Overall evolution and magnetic properties".ASTRONOMY & ASTROPHYSICS 652(2021).
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