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ASYMMETRY OF MAGNETIC HELICITY FLUX IN EMERGING BIPOLAR ACTIVE REGIONS
Yang D(杨丹)1,2; Jiang YC(姜云春)1; Yang JY(杨家艳)1; Bi Y(毕以)1; Yang B(杨波)1,2
Source PublicationJOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY
2014-06-30
Volume47Issue:3Pages:105-113
DOI10.5303/JKAS.2014.47.3.105
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Interior Sun: Magnetic Fields Sun: Photosphere
Abstract

We apply differential affine velocity estimator (DAVE) to the Solar Dynamics Observatory (SDO)/Helioseismic and Magnetic Imager (HMI) 12-min line-of-sight magnetograms, and separately calculate the injected magnetic helicity for the leading and the following polarities of nine emerging bipolar active regions (ARs). Comparing magnetic helicity flux of the leading polarity with the following polarity, we find that six ARs studied in this paper have the following polarity that injected more magnetic helicity flux than that of the leading polarity. We also measure the mean area of each polarity in all the nine ARs, and find that the compact polarity tend to possess more magnetic helicity flux than the fragmented one. Our results confirm the previous studies on asymmetry of magnetic helicity that emerging bipolar ARs have a polarity preference in injecting magnetic helicity. Based on the changes of unsigned magnetic flux, we divide the emergence process into two evolutionary stages: (1) an increasing stage before the peak flux and (2) a constant or decreasing stage after the peak flux. Obvious changes on magnetic helicity flux can be seen during transition from one stage to another. Seven ARs have one or both polarity that changed the sign of magnetic helicity flux. Additionally, the prevailing polarity of the two ARs, which injects more magnetic helicity, changes form the following polarity to the leading one.

Funding Project973 Program[2011CB811403] ; Natural Science Foundation of China[11173058] ; Natural Science Foundation of China[11273056] ; Natural Science Foundation of China[11333007] ; CAS[KJCX2-EW-T07]
Funding Organization973 Program[2011CB811403] ; Natural Science Foundation of China[11173058, 11273056, 11333007] ; CAS[KJCX2-EW-T07]
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
PublisherKOREAN ASTRONOMICAL SOCIETY
Publication Place61-1 HWA-AM DONG, YUSUNG KU, TAEJON, 305-348, SOUTH KOREA
ISSN1225-4614
URL查看原文
Archive Date2014-07-02
WOS IDWOS:000339089900003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordINDUCTION EQUATION ; HORIZONTAL MOTION ; CONVECTION ZONE ; SOLAR CORONA ; NOAA 10930 ; FIELDS ; ORIGIN ; EVOLUTION ; INJECTION ; TRANSPORT
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6249
Collection太阳物理研究组
Corresponding AuthorYang D(杨丹)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yang D,Jiang YC,Yang JY,et al. ASYMMETRY OF MAGNETIC HELICITY FLUX IN EMERGING BIPOLAR ACTIVE REGIONS[J]. JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,2014,47(3):105-113.
APA Yang D,Jiang YC,Yang JY,Bi Y,&Yang B.(2014).ASYMMETRY OF MAGNETIC HELICITY FLUX IN EMERGING BIPOLAR ACTIVE REGIONS.JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,47(3),105-113.
MLA Yang D,et al."ASYMMETRY OF MAGNETIC HELICITY FLUX IN EMERGING BIPOLAR ACTIVE REGIONS".JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY 47.3(2014):105-113.
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