The breakdown of the power-law frequency distributions for the hard X-ray peak count rates of solar flares
文献类型：期刊论文
| 作者 | Li, You-Ping1 ; Gan, Wei-Qun1; Feng, Li1; Liu, Si-Ming1; Struminsky, A.2
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2013-12-01 |
| 卷号 | 13期号:12页码:1482-1492 |
| 关键词 | Sun: flares Sun: X-rays, gamma-rays methods: statistical |
| ISSN号 | 1674-4527 |
| 英文摘要 | The 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SELF-ORGANIZED CRITICALITY ; NANOFLARE STATISTICS ; ENERGY-DISTRIBUTION ; QUIET SUN ; PARAMETERS ; ENERGETICS ; EVOLUTION ; BURSTS ; CORONA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000327875500009 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9867]  |
| 专题 | 紫金山天文台_太阳高能及相关物理过程研究团组 |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：紫金山天文台
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