DESPIKING OF SPACECRAFT ENERGETIC PROTON FLUX TO STUDY GALACTIC COSMIC-RAY MODULATION
文献类型：期刊论文
| 作者 | Qin, G. ; Zhao, L. -L.; Chen, H. -C.
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012 |
| 卷号 | 752期号:2页码:138 |
| ISSN号 | 0004-637X |
| 关键词 | cosmic rays methods: data analysis Sun: particle emission |
| 通讯作者 | Qin, G (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China. |
| 中文摘要 | Galactic cosmic ray (GCR) is usually assumed as a stable "background," with solar influence considered as a modulation. The violent solar energetic particle (SEP) events associated with solar activities change particle fluxes by several orders of magnitude in a few minutes. Thus, the flux observation of GCR provided by satellites may be heavily contaminated by spurious spikes due to SEPs, and that provided by ground-based neutron monitors (NMs) may be contaminated by the system error spikes and the ground level enhancement effect. To obtain the "pure" background GCR flux for modulation research, the removal of multifarious spikes is necessary. In this article, we use a robust automatic despiking algorithm based on the Poincare map thresholding method provided by Goring and Nikora for "purification" of the time-series GCR flux observations. We can show that the algorithm is good at cleaning up the heavily contaminated GCR intensity rates measured by both spacecraft and NMs without artificial parameters. In addition, using the algorithm to despike the spacecraft observations of relatively lower energetic proton flux, we get both 11 year and 27 day period cycles comparable to the much higher energy GCR flux data measured by the ground-based NMs. |
| 英文摘要 | Galactic cosmic ray (GCR) is usually assumed as a stable "background," with solar influence considered as a modulation. The violent solar energetic particle (SEP) events associated with solar activities change particle fluxes by several orders of magnitude in a few minutes. Thus, the flux observation of GCR provided by satellites may be heavily contaminated by spurious spikes due to SEPs, and that provided by ground-based neutron monitors (NMs) may be contaminated by the system error spikes and the ground level enhancement effect. To obtain the "pure" background GCR flux for modulation research, the removal of multifarious spikes is necessary. In this article, we use a robust automatic despiking algorithm based on the Poincare map thresholding method provided by Goring and Nikora for "purification" of the time-series GCR flux observations. We can show that the algorithm is good at cleaning up the heavily contaminated GCR intensity rates measured by both spacecraft and NMs without artificial parameters. In addition, using the algorithm to despike the spacecraft observations of relatively lower energetic proton flux, we get both 11 year and 27 day period cycles comparable to the much higher energy GCR flux data measured by the ground-based NMs. |
| 学科主题 | 空间物理 |
| 资助信息 | CMA [GYHY201106011]; National High-tech R&D Program of China (863 Program) [2010AA122200]; [NNSFC 41074125]; [NNSFC 41125016]; [NNSFC 40921063] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3189]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Qin, G.,Zhao, L. -L.,Chen, H. -C.. DESPIKING OF SPACECRAFT ENERGETIC PROTON FLUX TO STUDY GALACTIC COSMIC-RAY MODULATION[J]. ASTROPHYSICAL JOURNAL,2012,752(2):138. |
| APA | Qin, G.,Zhao, L. -L.,&Chen, H. -C..(2012).DESPIKING OF SPACECRAFT ENERGETIC PROTON FLUX TO STUDY GALACTIC COSMIC-RAY MODULATION.ASTROPHYSICAL JOURNAL,752(2),138. |
| MLA | Qin, G.,et al."DESPIKING OF SPACECRAFT ENERGETIC PROTON FLUX TO STUDY GALACTIC COSMIC-RAY MODULATION".ASTROPHYSICAL JOURNAL 752.2(2012):138. |
入库方式： OAI收割
来源：国家空间科学中心
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