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The phase relation between sunspot numbers and soft X-ray flares
Yan XL(闫晓理)1,2; Deng LH(邓林华)1; Qu ZQ(屈中权)1; Xu, CL3; Yan, XL (reprint author), Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
Source PublicationASTROPHYSICS AND SPACE SCIENCE
2011-05
Volume333Issue:1Pages:11-16
DOI10.1007/s10509-011-0593-1
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Flares Sun: Activity Sun: Sunspots
AbstractTo better understand long-term flare activity, we present a statistical study on soft X-ray flares from May 1976 to May 2008. It is found that the smoothed monthly peak fluxes of C-class, M-class, and X-class flares have a very noticeable time lag of 13, 8, and 8 months in cycle 21 respectively with respect to the smoothed monthly sunspot numbers. There is no time lag between the sunspot numbers and M-class flares in cycle 22. However, there is a one-month time lag for C-class flares and a one-month time lead for X-class flares with regard to sunspot numbers in cycle 22. For cycle 23, the smoothed monthly peak fluxes of C-class, M-class, and X-class flares have a very noticeable time lag of one month, 5 months, and 21 months respectively with respect to sunspot numbers. If we take the three types of flares together, the smoothed monthly peak fluxes of soft X-ray flares have a time lag of 9 months in cycle 21, no time lag in cycle 22 and a characteristic time lag of 5 months in cycle 23 with respect to the smoothed monthly sunspot numbers. Furthermore, the correlation coefficients of the smoothed monthly peak fluxes of M-class and X-class flares and the smoothed monthly sunspot numbers are higher in cycle 22 than those in cycles 21 and 23. The correlation coefficients between the three kinds of soft X-ray flares in cycle 22 are higher than those in cycles 21 and 23. These findings may be instructive in predicting C-class, M-class, and X-class flares regarding sunspot numbers in the next cycle and the physical processes of energy storage and dissipation in the corona.
Funding OrganizationNational Science Foundation of China (NSFC) [10903027, 10673031, 40636031, 11003041] ; Yunnan Science Foundation of China [2009CD120] ; National Basic Research Program of China 973
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-640X
URL查看原文
Archive Date2011-04-06
WOS IDWOS:000289000600004
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSOLAR-CYCLE ; ASYMMETRY ; NORTH ; HEMISPHERES ; PERIOD ; FLUX
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6180
Collection太阳物理研究组
Corresponding AuthorYan, XL (reprint author), Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan, 650011, P.R. China
2.Graduate School of Chinese Academy of Sciences, Zhongguancun, Beijing, P.R. China
3.Yunnan Normal University, Kunming, Yunnan, P.R. China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yan XL,Deng LH,Qu ZQ,et al. The phase relation between sunspot numbers and soft X-ray flares[J]. ASTROPHYSICS AND SPACE SCIENCE,2011,333(1):11-16.
APA Yan XL,Deng LH,Qu ZQ,Xu, CL,&Yan, XL .(2011).The phase relation between sunspot numbers and soft X-ray flares.ASTROPHYSICS AND SPACE SCIENCE,333(1),11-16.
MLA Yan XL,et al."The phase relation between sunspot numbers and soft X-ray flares".ASTROPHYSICS AND SPACE SCIENCE 333.1(2011):11-16.
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