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Establishment of NmF2 empirical model in the northern hemisphere based on COSMIC occultation data
Niu Jun; Fang HanXian; Weng LiBin; Fang, HX (reprint author), PLA Univ Sci & Technol, Inst Meteorol & Oceanog, Nanjing 211101, Jiangsu, Peoples R China.
Department空间科学部
Source PublicationSCIENCE CHINA-TECHNOLOGICAL SCIENCES
2014
Volume57Issue:2Pages:339-344
ISSN1674-7321
Language英语
KeywordEmpirical Nmf2 Model Empirical Orthogonal Function Decomposition Local Wavelet Power Spectrum Method Least Squares Method
AbstractIonospheric peak value of F2 layer (N (m) F (2)) is an important parameter in the ionosphere, which has important applications in short-wave communication, ionospheric modeling and so on. In this paper, the empirical orthogonal function (EOF) decomposition method is used to analyze the N (m) F (2) obtained from the occultation data. Daily spatial distribution of N (m) F (2) at the same time is relatively even. Variance of first modal is much larger than the other modals. A local wavelet power spectrum (LWPS) method is applied to analysis the cycle of F (10.7) index and time coefficient of first modal. The result shows that they have similar cycle distribution, indicating that F (10.7) index is the main factor affecting variation of N (m) F (2). A function is established between the tine coefficient of first modal and F (10.7) index, average F (10.7) index value of early 81 days f (p) by least squares method. The results show that contribution coefficient of f (p) is negative which indicates that f (p) has an inert effect existing in the ionosphere. Contribution coefficient of F (10.7) is positive, which is consistent with the fact that it has an anomaly in winter/spring seasons. In summary, it is feasible to establish a mid-latitude empirical N (m) F (2) model in northern hemisphere based on occultation data and EOF decomposition method.
Indexed BySCI ; EI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/2736
Collection空间科学部
Corresponding AuthorFang, HX (reprint author), PLA Univ Sci & Technol, Inst Meteorol & Oceanog, Nanjing 211101, Jiangsu, Peoples R China.
Recommended Citation
GB/T 7714
Niu Jun,Fang HanXian,Weng LiBin,et al. Establishment of NmF2 empirical model in the northern hemisphere based on COSMIC occultation data[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2014,57(2):339-344.
APA Niu Jun,Fang HanXian,Weng LiBin,&Fang, HX .(2014).Establishment of NmF2 empirical model in the northern hemisphere based on COSMIC occultation data.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,57(2),339-344.
MLA Niu Jun,et al."Establishment of NmF2 empirical model in the northern hemisphere based on COSMIC occultation data".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 57.2(2014):339-344.
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