The phase relation between sunspot numbers and soft X-ray flares

doi:10.1007/s10509-011-0593-1

YNAO OpenIR > 太阳物理研究组

	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
DOI	10.1007/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
ISSN	0004-640X
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	被引频次：26[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/6180
专题	太阳物理研究组抚仙湖太阳观测和研究基地
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
第一作者单位	中国科学院云南天文台
推荐引用方式 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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