NSSC OpenIR  > 空间科学部
The effect of similar to 27 day solar rotation on ionospheric F-2 region peak densities (NmF2)
Ma, Ruiping; Xu, Jiyao; Wang, Wenbin; Lei, Jiuhou; Ma, RP (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2012
Volume117Pages:A03303
ISSN0148-0227
Language英语
AbstractIonospheric F-2 region peak electron densities (NmF2) observed from 11 ionosonde stations in the East Asian-Australian sector from 1969 to 1986 have been used to investigate the effect of similar to 27 day solar rotation on the ionosphere. These stations were located from the magnetically equatorial regions to the middle latitudes in both hemispheres. We found that, averaged over all stations and for 18 years, the normalized standard deviation of the midday similar to 27 day variations of NmF2 was 8% and that of the midnight variations was 10%. We applied different data analysis methods, including Fourier transform, band-pass filter, and multiple linear regression analysis, to determine quantitatively the sources of the observed similar to 27 day variations of NmF2 and their relative contributions to these variations. Our results show that the similar to 27 day variations in solar radiation and geomagnetic activity, caused by solar rotation, are the main drivers of the ionospheric similar to 27 day variations. They accounted for more than 85% of the variations seen in the NmF2 similar to 27 day variation, and their contributions became about 95% at higher latitudes. At geomagnetically low latitudes, the contribution of the similar to 27 day variation in solar EUV radiation was greater than that of the similar to 27 day variation in geomagnetic activity. However, the contribution from geomagnetic activity became more significant and was even larger than the contribution of solar radiation at higher latitudes, especially at midnight. At all latitudes the correlation between the similar to 27 day variations of NmF2 and solar radiation was evidently positive, whereas that between NmF2 and geomagnetic activity was positive at geomagnetically low latitudes and became negative at higher middle latitudes. We did not found large seasonal or solar cycle changes in the similar to 27 day variations of NmF2. These variations, however, did show significant differences between the two hemispheres.; Ionospheric F-2 region peak electron densities (NmF2) observed from 11 ionosonde stations in the East Asian-Australian sector from 1969 to 1986 have been used to investigate the effect of similar to 27 day solar rotation on the ionosphere. These stations were located from the magnetically equatorial regions to the middle latitudes in both hemispheres. We found that, averaged over all stations and for 18 years, the normalized standard deviation of the midday similar to 27 day variations of NmF2 was 8% and that of the midnight variations was 10%. We applied different data analysis methods, including Fourier transform, band-pass filter, and multiple linear regression analysis, to determine quantitatively the sources of the observed similar to 27 day variations of NmF2 and their relative contributions to these variations. Our results show that the similar to 27 day variations in solar radiation and geomagnetic activity, caused by solar rotation, are the main drivers of the ionospheric similar to 27 day variations. They accounted for more than 85% of the variations seen in the NmF2 similar to 27 day variation, and their contributions became about 95% at higher latitudes. At geomagnetically low latitudes, the contribution of the similar to 27 day variation in solar EUV radiation was greater than that of the similar to 27 day variation in geomagnetic activity. However, the contribution from geomagnetic activity became more significant and was even larger than the contribution of solar radiation at higher latitudes, especially at midnight. At all latitudes the correlation between the similar to 27 day variations of NmF2 and solar radiation was evidently positive, whereas that between NmF2 and geomagnetic activity was positive at geomagnetically low latitudes and became negative at higher middle latitudes. We did not found large seasonal or solar cycle changes in the similar to 27 day variations of NmF2. These variations, however, did show significant differences between the two hemispheres.
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/122/3198
Collection空间科学部
Corresponding AuthorMa, RP (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Ma, Ruiping,Xu, Jiyao,Wang, Wenbin,et al. The effect of similar to 27 day solar rotation on ionospheric F-2 region peak densities (NmF2)[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A03303.
APA Ma, Ruiping,Xu, Jiyao,Wang, Wenbin,Lei, Jiuhou,&Ma, RP .(2012).The effect of similar to 27 day solar rotation on ionospheric F-2 region peak densities (NmF2).JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A03303.
MLA Ma, Ruiping,et al."The effect of similar to 27 day solar rotation on ionospheric F-2 region peak densities (NmF2)".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A03303.
Files in This Item: Download All
File Name/Size DocType Version Access License
2012117A03303.pdf(2367KB) 开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Ma, Ruiping]'s Articles
[Xu, Jiyao]'s Articles
[Wang, Wenbin]'s Articles
Baidu academic
Similar articles in Baidu academic
[Ma, Ruiping]'s Articles
[Xu, Jiyao]'s Articles
[Wang, Wenbin]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Ma, Ruiping]'s Articles
[Xu, Jiyao]'s Articles
[Wang, Wenbin]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2012117A03303.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.