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Terannual variation in the F-2 layer peak electron density (NmF2) at middle latitudes
Xu, Jiyao; Ma, Ruiping; Wang, Wenbin; Xu, JY (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2012
Volume117Pages:A01308
ISSN0148-0227
Language英语
AbstractIonosonde data from 33 stations in three longitude sectors from 1969 to 1986 have been used to study the seasonal variations of ionospheric F-2 layer peak electron densities (NmF2). We found that there is a periodic oscillation in daytime NmF2 with a period of 4 months (terannual). Our analysis shows that there is a very good phase match between the annual and semiannual oscillations and the terannual oscillations. These three oscillations vary with solar activity in the same way: large amplitudes during solar maximum. The amplitude of the terannual oscillation is also correlated with the product of the amplitudes of annual and semiannual oscillations. These suggest that the terannual oscillation might be related to the nonlinear interaction between the annual and semiannual oscillations. In addition, the terannual oscillation is stronger in the midlatitude region in the Northern Hemisphere than in the Southern Hemisphere. Furthermore, there are large differences in the ionospheric seasonal variations between daytime and nighttime. No obvious terannual oscillation signature is seen in the nighttime F-2 layer.; Ionosonde data from 33 stations in three longitude sectors from 1969 to 1986 have been used to study the seasonal variations of ionospheric F-2 layer peak electron densities (NmF2). We found that there is a periodic oscillation in daytime NmF2 with a period of 4 months (terannual). Our analysis shows that there is a very good phase match between the annual and semiannual oscillations and the terannual oscillations. These three oscillations vary with solar activity in the same way: large amplitudes during solar maximum. The amplitude of the terannual oscillation is also correlated with the product of the amplitudes of annual and semiannual oscillations. These suggest that the terannual oscillation might be related to the nonlinear interaction between the annual and semiannual oscillations. In addition, the terannual oscillation is stronger in the midlatitude region in the Northern Hemisphere than in the Southern Hemisphere. Furthermore, there are large differences in the ionospheric seasonal variations between daytime and nighttime. No obvious terannual oscillation signature is seen in the nighttime F-2 layer.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3109
Collection空间科学部
Corresponding AuthorXu, JY (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Xu, Jiyao,Ma, Ruiping,Wang, Wenbin,et al. Terannual variation in the F-2 layer peak electron density (NmF2) at middle latitudes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A01308.
APA Xu, Jiyao,Ma, Ruiping,Wang, Wenbin,&Xu, JY .(2012).Terannual variation in the F-2 layer peak electron density (NmF2) at middle latitudes.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A01308.
MLA Xu, Jiyao,et al."Terannual variation in the F-2 layer peak electron density (NmF2) at middle latitudes".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A01308.
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