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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; Yang, D (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY
2014-06-30
卷号47期号:3页码:105-113
DOI10.5303/JKAS.2014.47.3.105
产权排序第1完成单位
收录类别SCI
关键词Sun: Interior Sun: Magnetic Fields Sun: Photosphere
摘要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.
项目资助者973 Program [2011CB811403] ; Natural Science Foundation of China [11173058, 11273056, 11333007] ; CAS [KJCX2-EW-T07]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1225-4614
URL查看原文
归档日期2014-07-02
WOS记录号WOS:000339089900003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]INDUCTION EQUATION ; HORIZONTAL MOTION ; CONVECTION ZONE ; SOLAR CORONA ; NOAA 10930 ; FIELDS ; ORIGIN ; EVOLUTION ; INJECTION ; TRANSPORT
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6249
专题太阳物理研究组
通讯作者Yang, D (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
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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,&Yang, D .(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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