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The breakdown of the power-law frequency distributions for the hard X-ray peak count rates of solar flares
Li, You-Ping1; Gan, Wei-Qun1; Feng, Li1; Liu, Si-Ming1; Struminsky, A.2
2013-12-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume13Issue:12Pages:1482-1492
AbstractThe frequency distribution for several characteristics of a solar flare obeys a power law only above a certain threshold, below which there is an apparent loss of small scale events presumably caused by limited instrumental sensitivity and the corresponding event selection bias. It is also possible that this deviation in the power law can have a physical origin in the source. We propose two fitting models incorporating a power law distribution with a low count rate cutoff plus a noise component for the frequency distribution of the hard X-ray peak count rate of all solar flare samples obtained with HXRBS/SMM and BATSE/CGRO observations. Our new fitting method produces the same power-law index as previously developed methods, a low cutoff of the power-law function and its corresponding noise level, which is consistent with measurements of the actual noise level of the hard X-ray count rate. We found that the fitted low cutoff appears to be related to the noise level, i.e., flares are only recognized when their peak count rate is 3 sigma greater than noise. Therefore, the fitted low cutoff, which is smaller than the aforementioned threshold, might be attributed to selection bias, and probably not to the actual count rate cutoff in flares at smaller scales. Whether or not the actual low cutoff physically exists needs to be checked by future observations with increased sensitivities.
KeywordSun: Flares Sun: X-rays, Gamma-rays Methods: Statistical
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordSELF-ORGANIZED CRITICALITY ; NANOFLARE STATISTICS ; ENERGY-DISTRIBUTION ; QUIET SUN ; PARAMETERS ; ENERGETICS ; EVOLUTION ; BURSTS ; CORONA
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000327875500009
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9867
Collection太阳高能及相关物理过程研究团组
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Russian Acad Sci, Space Res Inst IKI, Moscow 117997, Russia
Recommended Citation
GB/T 7714
Li, You-Ping,Gan, Wei-Qun,Feng, Li,et al. The breakdown of the power-law frequency distributions for the hard X-ray peak count rates of solar flares[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(12):1482-1492.
APA Li, You-Ping,Gan, Wei-Qun,Feng, Li,Liu, Si-Ming,&Struminsky, A..(2013).The breakdown of the power-law frequency distributions for the hard X-ray peak count rates of solar flares.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(12),1482-1492.
MLA Li, You-Ping,et al."The breakdown of the power-law frequency distributions for the hard X-ray peak count rates of solar flares".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.12(2013):1482-1492.
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