Longitudinal difference in total electron content over the East Asian   region: Feature and explanation

doi:10.1016/j.jastp.2016.08.015

CORC > 北京大学 > 地球与空间科学学院

	Longitudinal difference in total electron content over the East Asian region: Feature and explanation
	Yu, Shimei ; Xiao, Zuo ; Zhao, Biqiang ; Zhang, Donghe ; Hao, Yongqiang
刊名	JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
	2016
关键词	Ionospheric longitudinal difference TEC Thermospheric wind effect GRAVITY-WAVE ACTIVITY SATELLITE DATA NORTH-AMERICA GLOBAL-MODEL GPS NETWORK TEC WINDS PERTURBATIONS THERMOSPHERE CLIMATOLOGY
DOI	10.1016/j.jastp.2016.08.015
英文摘要	The mechanism of the longitudinal difference of ionospheric electron density is in general attributed to the thermospheric wind effect modulated by the local geomagnetic declination. Although this mechanism is tested in many case studies, there are other possible factors such as solar activity and so on which still need further investigations. In this paper, TEC data from two Chinese GPS stations located at almost same geographic latitudes but with a wide longitude span (similar to 38 degrees) are used to study the morphological features of longitudinal differences under various geophysical conditions. A parameter R-ew is defined as a normalized measure of the TEC difference between the two stations. All the observed temporal variations of R-ew are analyzed statistically, with the results showing that negative east-west differences (Western TEC > Eastern TEC) in the noontime are pronounced during Day of Year (DoY) 90-270, while nighttime positive differences (Western TEC < Eastern TEC) are around DoY 60-90, and 270-300. All above observed features are examined by the dynamic effect of thermospheric wind using the HWM07 model. The results show that although the zonal wind does play an important role on average, it is not sufficient to explain all the observed features, the longitude dependence of the meridian wind must be considered. Finally, we observed a new feature characterized by the summer nighttime positive value in R-ew which could be related to a Midlatitude Summer Night Anomaly (MSNA) phenomenon. So, it is also concluded that besides the thermospheric wind effect, other mechanisms such as the longitudinal dependence of the plasmaspheric downward flux should also be taken into consideration in explaining the longitudinal differences in the ionosphere. (C) 2004 Published by Elsevier Ltd.; Chinese Academy of Sciences [KZZD-EW-01]; National Science Foundation of China [41131066, 41574144, 41274155, 41174138, 41174065, 41321003]; National Important Basic Research Project [2011CB811405, 2012CB825604]; SCI(E); EI; ARTICLE; zxiao@pku.edu.cn; 74-81; 148
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/450044]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Yu, Shimei,Xiao, Zuo,Zhao, Biqiang,et al. Longitudinal difference in total electron content over the East Asian region: Feature and explanation[J]. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,2016.
APA	Yu, Shimei,Xiao, Zuo,Zhao, Biqiang,Zhang, Donghe,&Hao, Yongqiang.(2016).Longitudinal difference in total electron content over the East Asian region: Feature and explanation.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS.
MLA	Yu, Shimei,et al."Longitudinal difference in total electron content over the East Asian region: Feature and explanation".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS (2016).