Ionospheric absorption and planetary wave activity in East Asia sector

	Ionospheric absorption and planetary wave activity in East Asia sector
	Hao YongQiang; Zhang DongHe
刊名	SCIENCE CHINA-TECHNOLOGICAL SCIENCES
	2012
卷号	55 期号:5 页码:1264-1272
关键词	ionospheric absorption winter anomaly atmosphere-ionosphere coupling
ISSN号	1674-7321
通讯作者	Hao, YQ (reprint author), Peking Univ, Inst Space Phys & Appl Technol, Beijing 100871, Peoples R China.
中文摘要	In this paper, we focus on ionospheric absorption in the East Asia sector, and look for manifestations of atmospheric influences in this area. First, a 4-year historical record of absorption measurement at Beijing is presented. This record was obtained by a sweep frequency technique, in which 27-days periodic variation of the absorption level was found to be dominant, appearing in most seasons except winters. Instead, unusual enhancements of the absorption level appeared in winters (winter anomaly), at the meantime the level varied with periods mainly in the range of 8-12 days. Comparing to 27-days period from the Sun, the shorter period oscillations should be related to planetary wave activities in lower atmosphere. Second, f(min) data from 5 mid-latitude ionosondes in Japan were used as an indirect but long-term measurement. With the f(min) data covering two solar cycles, disturbances with various periods were found to be active around solar maximum years, but the 8-12 days oscillations always existed in winter, showing seasonal dependence instead of connection to solar activity. These results given in this paper demonstrate seasonal and solar cycle-dependent features of the ionospheric absorption in East Asia sector, and confirm the existence of influence from atmosphere-ionosphere coupling in this area, as well as the relationship between ionospheric winter anomaly and planetary wave activity.
英文摘要	In this paper, we focus on ionospheric absorption in the East Asia sector, and look for manifestations of atmospheric influences in this area. First, a 4-year historical record of absorption measurement at Beijing is presented. This record was obtained by a sweep frequency technique, in which 27-days periodic variation of the absorption level was found to be dominant, appearing in most seasons except winters. Instead, unusual enhancements of the absorption level appeared in winters (winter anomaly), at the meantime the level varied with periods mainly in the range of 8-12 days. Comparing to 27-days period from the Sun, the shorter period oscillations should be related to planetary wave activities in lower atmosphere. Second, f(min) data from 5 mid-latitude ionosondes in Japan were used as an indirect but long-term measurement. With the f(min) data covering two solar cycles, disturbances with various periods were found to be active around solar maximum years, but the 8-12 days oscillations always existed in winter, showing seasonal dependence instead of connection to solar activity. These results given in this paper demonstrate seasonal and solar cycle-dependent features of the ionospheric absorption in East Asia sector, and confirm the existence of influence from atmosphere-ionosphere coupling in this area, as well as the relationship between ionospheric winter anomaly and planetary wave activity.
学科主题	空间物理
收录类别	SCI ; EI
资助信息	National Natural Science Foundation of China [40904036]; State Oceanic Administration of China [201005017]; National Basic Research Program of China ("973" Project) [2011CB811405]; Specialized Research Fund for State Key Laboratories
语种	英语
公开日期	2014-12-15
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/3268]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Hao YongQiang,Zhang DongHe. Ionospheric absorption and planetary wave activity in East Asia sector[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2012,55(5):1264-1272.
APA	Hao YongQiang,&Zhang DongHe.(2012).Ionospheric absorption and planetary wave activity in East Asia sector.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,55(5),1264-1272.
MLA	Hao YongQiang,et al."Ionospheric absorption and planetary wave activity in East Asia sector".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 55.5(2012):1264-1272.