Establishment of NmF2 empirical model in the northern hemisphere based on COSMIC occultation data

	Establishment of NmF2 empirical model in the northern hemisphere based on COSMIC occultation data
	Niu Jun; Fang HanXian; Weng LiBin
刊名	SCIENCE CHINA-TECHNOLOGICAL SCIENCES
	2014
卷号	57 期号:2 页码:339-344
关键词	empirical NmF2 model empirical orthogonal function decomposition local wavelet power spectrum method least squares method
ISSN号	1674-7321
通讯作者	Fang, HX (reprint author), PLA Univ Sci & Technol, Inst Meteorol & Oceanog, Nanjing 211101, Jiangsu, Peoples R China.
英文摘要	Ionospheric 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.
学科主题	空间物理
收录类别	SCI ; EI
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/2736]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Niu Jun,Fang HanXian,Weng LiBin. 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.(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.