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The Periodic and Temporal Behaviors of Solar X-Ray Flares in Solar Cycles 23 and 24
Oloketuyi, Jacob1,2,3; Liu Y(刘煜)1,2; Zhao MY(赵明宇)1,2
Source PublicationASTROPHYSICAL JOURNAL
2019-03-20
Volume874Issue:1Pages:10
DOI10.3847/1538-4357/ab064c
Contribution Rank第1完成单位
Indexed BySCI
Keywordmethods: data analysis Sun: activity Sun: flares sunspots
Abstract

The recent solar cycles 23 and 24 are thought to be unusually quiet with more prolonged periods. Both sunspot groups and solar soft X-ray (SXR) flares show a decline in numbers comparable to cycles 21 and 22. In order to understand the periodic variations and distributions of solar flares with the sunspot group numbers in these cycles, this study investigates the periodicities and distributions of the solar SXR flares, 36354 in total (B (13351) 36.7%, C (20699) 56.9%, M (2141) 5.9%, and X (163) 0.45%) between 1996 July and 2016 December. The continuous wavelet transforms and cross-correlation methods were used to carry out the study. First, we found that the B- class flare number is asynchronous and negatively correlated with the sunspot group numbers. The flare class exhibits deviation when sunspot group numbers rise or fall around 100. The other class flares are in phase, synchronous with the sunspot group numbers. The C-class flares show the highest level of correlation of 0.868 with sunspot group numbers. A different number of short and intermediate periodicities was also noticed among the flare classes. Notable 256-day periodicity is found for B flares, 7, 64, and 300 days for C, 32, 64, and 256 days for M flares, and 40, 32, and 25 days for X flares. The difference in periodic variations of the flare classes could be attributed to the magnetic flux system of sunspot groups producing them.

Funding ProjectCAS-TWAS ; National Science Foundation of China[NSFC: 11533009] ; National Science Foundation of China[11603074] ; Key Laboratory of Geospace Environment, CAS, University of Science and Technology of China ; West Light Foundation, CAS
Funding OrganizationCAS-TWAS ; National Science Foundation of China[NSFC: 11533009, 11603074] ; Key Laboratory of Geospace Environment, CAS, University of Science and Technology of China ; West Light Foundation, CAS
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:000461631600007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTERM PERIODICITIES ; WAVELET TRANSFORM ; MAGNETIC-FLUX ; SUNSPOT ; INDEX ; COHERENCE ; 154-DAY ; SUN
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/19504
Collection选址与日冕观测组
Corresponding AuthorLiu Y(刘煜)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
2.Key Laboratory of Geospace Environment, Chinese Academy of Sciences, University of Science & Technology of China, Hefei 230026, People's Republic of China
3.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Oloketuyi, Jacob,Liu Y,Zhao MY. The Periodic and Temporal Behaviors of Solar X-Ray Flares in Solar Cycles 23 and 24[J]. ASTROPHYSICAL JOURNAL,2019,874(1):10.
APA Oloketuyi, Jacob,Liu Y,&Zhao MY.(2019).The Periodic and Temporal Behaviors of Solar X-Ray Flares in Solar Cycles 23 and 24.ASTROPHYSICAL JOURNAL,874(1),10.
MLA Oloketuyi, Jacob,et al."The Periodic and Temporal Behaviors of Solar X-Ray Flares in Solar Cycles 23 and 24".ASTROPHYSICAL JOURNAL 874.1(2019):10.
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