A global model of the ionospheric F2 peak height based on EOF analysis
文献类型：期刊论文
| 作者 | Zhang, M. -L.; Liu, C.; Wan, W.; Liu, L.; Ning, B. |
| 刊名 | ANNALES GEOPHYSICAE
 |
| 出版日期 | 2009 |
| 卷号 | 27期号:8页码:3203-3212 |
| 关键词 | Ionosphere Equatorial ionosphere Mid-latitude ionosphere Modelling and forecasting |
| ISSN号 | 0992-7689 |
| 文献子类 | Article |
| 英文摘要 | The ionospheric F2 peak height hmF2 is an important parameter that is much needed in ionospheric research and practical applications. In this paper, an attempt is made to develop a global model of hmF2. The hmF2 data, used to construct the global model, are converted from the monthly median hourly values of the ionospheric propagation factor M(3000)F2 observed by ionosondes/digisondes distributed globally, based on the strong anti-correlation existed between hmF2 and M(3000)F2. The empirical orthogonal function (EOF) analysis method, combined with harmonic function and regression analysis, is used to construct the model. The technique used in the global modelling involves two layers of EOF analysis of the dataset. The first layer EOF analysis is applied to the hmF2 dataset which decomposed the dataset into a series of orthogonal functions (EOF base functions) E(k) and their associated EOF coefficients P(k). The base functions E(k) represent the intrinsic characteristic variations of the dataset with the modified dip latitude and local time, the coefficients P(k) represents the variations of the dataset with the universal time, season as well as solar cycle activity levels. The second layer EOF analysis is applied to the EOF coefficients P(k) obtained in the first layer EOF analysis. The coefficients A(k), obtained in the second layer EOF analysis, are then modelled with the harmonic functions representing the seasonal (annual and semi-annual) and solar cycle variations, with their amplitudes changing with the F(10.7) index, a proxy of the solar activity level. Thus, the constructed global model incorporates the geographical location, diurnal, seasonal as well as solar cycle variations of hmF2 through the combination of EOF analysis and the harmonic function expressions of the associated EOF coefficients. Comparisons between the model results and observational data were consistent, indicating that the modelling technique used is very promising when used to construct the global model of hmF2 and it has the potential of being used for the global modelling/mapping of other ionospheric parameters. Statistical analysis on model-data comparison showed that our constructed model of hmF2, based on the EOF expansion method, compares better with the observational data than the model currently used in the International Reference Ionosphere (IRI) model. |
| WOS关键词 | ELECTRON-CONCENTRATION ; LATITUDE ; DENSITY ; SIMULATION ; SPACE ; HMF2 ; IRI |
| WOS研究方向 | Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000269440700022 |
| 出版者 | COPERNICUS PUBLICATIONS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/70291]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang, M. -L. |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, M. -L.,Liu, C.,Wan, W.,et al. A global model of the ionospheric F2 peak height based on EOF analysis[J]. ANNALES GEOPHYSICAE,2009,27(8):3203-3212. |
| APA | Zhang, M. -L.,Liu, C.,Wan, W.,Liu, L.,&Ning, B..(2009).A global model of the ionospheric F2 peak height based on EOF analysis.ANNALES GEOPHYSICAE,27(8),3203-3212. |
| MLA | Zhang, M. -L.,et al."A global model of the ionospheric F2 peak height based on EOF analysis".ANNALES GEOPHYSICAE 27.8(2009):3203-3212. |
入库方式： OAI收割
来源：地质与地球物理研究所
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