The dependence of plasma density in the topside ionosphere on the solar activity level

	The dependence of plasma density in the topside ionosphere on the solar activity level
	Liu, L.; Wan, W.; Yue, X.; Zhao, B.; Ning, B.; Zhang, M.-L.
刊名	ANNALES GEOPHYSICAE
	2007
卷号	25 期号:6 页码:1337-1343
关键词	solar physics, astrophysics, and astronomy ultraviolet emissions ionosphere plasma temperature and density solar radiation and cosmic ray effects
ISSN号	0992-7689
文献子类	Article
英文摘要	In this paper, the ten-year (1996-2005) total ion density Ni measurements from the Defense Meteorological Satellite Program (DMSP) spacecraft in the morning and evening (09:30 and 21:30 LT) sectors have been analyzed to explore the dependence of plasma densities in the topside ionosphere at middle and low latitudes on the solar activity level. Results indicate that there is a strong solar activity dependence of DMSP Ni at 848 km altitude, which has latitudinal and seasonal features. The plasma density in the topside ionosphere has an approximately linear dependence on daily F107 and a strongly nonlinear dependence on SEM/SOHO EUV, such that the change rate of Ni becomes greater with increasing solar EUV This is quite different from the dependence of Ni near the F-Region peak (NmF(2)), at which the rate of chan-e of NmF(2) decreases with increasing solar EUV. The rate of change of Ni at the DMSP altitude is greatest in the latitude range where Ni is greatest during high solar activity. We suggest that this greater rate of change (or amplification effect) of Ni at the DMSP altitude is mainly a consequence of the solar activity variations of the topside scale height. The changes in the height of the F-Region peak (hmF(2)) and the density NmF(2) play a secondary role.
WOS关键词	SCALE HEIGHT ; ELECTRON-DENSITY ; CYCLE VARIATIONS ; IONIZATION ; EUV ; FOF2
WOS研究方向	Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
语种	英语
出版者	EUROPEAN GEOSCIENCES UNION
WOS记录号	WOS:000248406700010
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67610]
专题	中国科学院地质与地球物理研究所
通讯作者	Liu, L.
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Liu, L.,Wan, W.,Yue, X.,et al. The dependence of plasma density in the topside ionosphere on the solar activity level[J]. ANNALES GEOPHYSICAE,2007,25(6):1337-1343.
APA	Liu, L.,Wan, W.,Yue, X.,Zhao, B.,Ning, B.,&Zhang, M.-L..(2007).The dependence of plasma density in the topside ionosphere on the solar activity level.ANNALES GEOPHYSICAE,25(6),1337-1343.
MLA	Liu, L.,et al."The dependence of plasma density in the topside ionosphere on the solar activity level".ANNALES GEOPHYSICAE 25.6(2007):1337-1343.