NAOC Open IR
A quantity characterizing variation of observed magnetic twist in solar active regions
Gao, Yu
2018-03-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume18Issue:3Pages:10
AbstractAn alternative parameter R-Jz is introduced as the ratio of one of two kinds of opposite-sign current to the total current and is used to investigate the relationship between this quantity and the hemispheric helicity sign rule (HSR) that has been established by a series of previous statistical studies. The classification of current in each hemisphere obeys the following rule: if the product of the current and the corresponding longitudinal field component contributes a consistent sign with respect to the HSR, it is called "HSR-compliant" current, otherwise it is called "HSR-noncompliant" current. Firstly, consistency between the butterfly diagram of R-Jz and current helicity was obtained in a statistical study. Active regions with R-Jz smaller than 0.5 tend to obey the HSR whereas those with R-Jz greater than 0.5 tend to disobey it. The "HSR-compliant" current systems have a 60% probability of realization compared to 40% for "HSR-noncompliant" current systems. Overall, the HSR is violated for active regions in which the " HSR-noncompliant" current is greater than the " HSR-compliant" current. Secondly, the parameter R-Jz was subsequently used to study the evolution of current systems in the case analyses of flare-productive active regions NOAA AR 11158 and AR 11283. It is found that there is a "R-Jz-quasistationary" phase that is relatively flare quiescent and "R-Jz-dynamic" phase that is characterized by the occurrence of large flares.
KeywordSun: activity Sun: flares Sun: magnetic fields Sun: evolution Sun: sunspots
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA
DOI10.1088/1674-4527/18/3/28
WOS KeywordELECTRIC-CURRENT HELICITY ; HEMISPHERIC SIGN RULE ; EMERGING FLUX ; EVOLUTION ; FIELDS ; CYCLE ; FLARES ; DYNAMO ; ATMOSPHERE ; PATTERNS
Language英语
Funding ProjectNational Natural Science Foundation of China[11103037] ; National Natural Science Foundation of China[11273034] ; National Natural Science Foundation of China[11178005] ; National Natural Science Foundation of China[41174153] ; National Natural Science Foundation of China[11173033] ; National Natural Science Foundation of China[11473039] ; National Natural Science Foundation of China[11427901] ; National Natural Science Foundation of China[11673033] ; National Basic Research Program of China[2000078401] ; National Basic Research Program of China[2006CB806301] ; Chinese Academy of Sciences[KJCX2-EW-T07] ; NASA[NAS5-02139]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NASA ; NASA
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000428268500004
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37085
Collection中国科学院国家天文台
Corresponding AuthorGao, Yu
AffiliationChinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Gao, Yu. A quantity characterizing variation of observed magnetic twist in solar active regions[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(3):10.
APA Gao, Yu.(2018).A quantity characterizing variation of observed magnetic twist in solar active regions.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(3),10.
MLA Gao, Yu."A quantity characterizing variation of observed magnetic twist in solar active regions".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.3(2018):10.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Gao, Yu]'s Articles
Baidu academic
Similar articles in Baidu academic
[Gao, Yu]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Gao, Yu]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.