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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.
发表期刊ASTROPHYSICS AND SPACE SCIENCE
2011-05
卷号333期号:1页码:11-16
DOI10.1007/s10509-011-0593-1
产权排序第1完成单位
收录类别SCI
关键词Sun: Flares Sun: Activity Sun: Sunspots
摘要To 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.
项目资助者National Science Foundation of China (NSFC) [10903027, 10673031, 40636031, 11003041] ; Yunnan Science Foundation of China [2009CD120] ; National Basic Research Program of China 973
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-640X
URL查看原文
归档日期2011-04-06
WOS记录号WOS:000289000600004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SOLAR-CYCLE ; ASYMMETRY ; NORTH ; HEMISPHERES ; PERIOD ; FLUX
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6180
专题太阳物理研究组
通讯作者Yan, XL (reprint author), Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Yunnan, Peoples R China.
作者单位1.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
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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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