Features of annual and semiannual variations derived from the global ionospheric maps of total electron content

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 2011年以前论文发表（包括2011年）

	Features of annual and semiannual variations derived from the global ionospheric maps of total electron content
	Zhao, B.1; Wan, W.1; Liu, L.1; Mao, T.1,2,3; Ren, Z.1,2,3; Wang, M.1,2,3; Christensen, A. B.4
刊名	ANNALES GEOPHYSICAE
	2007
卷号	25 期号:12 页码:2513-2527
关键词	atmospheric composition and structure thermosphere-composition and chemistry ionosphere mid-latitude ionosphere equatorial ionosphere
英文摘要	In the present work we use the NASA-JPL global ionospheric maps of total electron content (TEC), firstly to construct TEC maps (TEC vs. magnetic local time MLT, and magnetic latitude MLAT) in the interval from 1999 to 2005. These TEC maps were, in turn, used to estimate the annual-to-mean amplitude ratio, A(1), and the semiannual-to-mean amplitude ratio, A(2), as well as the latitudinal symmetrical and asymmetrical parts, A' and A' of A(1). Thus, we investigated in detail the TEC climatology from maps of these indices, with an emphasis on the quantitative presentation for local time and latitudinal changes in the seasonal, annual and semiannual anomalies of the ionospheric TEC. Then we took the TEC value at 14:00 LT to examine various anomalies at a global scale following the same procedure. Results reveal similar features appearing in NmF2, such as that the seasonal anomaly is more significant in the near-pole regions than in the far-pole regions and the reverse is true for the semiannual anomaly; the winter anomaly has least a chance to be observed at the South America and South Pacific areas. The most impressive feature is that the equinoctial asymmetry is most prominent at the East Asian and South Australian areas. Through the analysis of the TIMED GUVI columnar [O/N2] data, we have investigated to what extent the seasonal, annual and semiannual variations can be explained by their counterparts in [O/N2]. Results revealed that the [O/N2] variation is a major contributor to the daytime winter anomaly of TEC, and it also contributes to some of the semiannual and annual anomalies. The contribution to the anomalies unexplained by the [O/N2] data could possibly be due to the dynamics associated with thermospheric winds and electric fields.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
研究领域[WOS]	Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
关键词[WOS]	SOLAR-CYCLE VARIATIONS ; WORLDWIDE GPS NETWORK ; TOPSIDE IONOSPHERE ; PLASMA DRIFTS ; F2 LAYER ; F2-LAYER ; THERMOSPHERE ; DENSITY ; REGION ; CIRCULATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000252860200005
公开日期	2015-09-08
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/7815]
专题	武汉物理与数学研究所_2011年以前论文发表（包括2011年）
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Wuhan Inst Phys & Math, Wuhan 430071, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China 4.Aerosp Corp, Space Sci Applicat Lab, El Segundo, CA USA
推荐引用方式 GB/T 7714	Zhao, B.,Wan, W.,Liu, L.,et al. Features of annual and semiannual variations derived from the global ionospheric maps of total electron content[J]. ANNALES GEOPHYSICAE,2007,25(12):2513-2527.
APA	Zhao, B..,Wan, W..,Liu, L..,Mao, T..,Ren, Z..,...&Christensen, A. B..(2007).Features of annual and semiannual variations derived from the global ionospheric maps of total electron content.ANNALES GEOPHYSICAE,25(12),2513-2527.
MLA	Zhao, B.,et al."Features of annual and semiannual variations derived from the global ionospheric maps of total electron content".ANNALES GEOPHYSICAE 25.12(2007):2513-2527.