The effect of similar to 27 day solar rotation on ionospheric F-2 region peak densities (NmF2)
文献类型：期刊论文
| 作者 | Ma, Ruiping; Xu, Jiyao; Wang, Wenbin; Lei, Jiuhou |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
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| 出版日期 | 2012 |
| 卷号 | 117页码:A03303 |
| ISSN号 | 0148-0227 |
| 通讯作者 | Ma, RP (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China. |
| 中文摘要 | 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. |
| 英文摘要 | 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. |
| 学科主题 | 空间物理 |
| 资助信息 | National Science Foundation of China [40890165, 40921063, 41174139]; National Important Basic Research Project [2011CB811405]; Specialized Research Fund for State Key Laboratories; NASA [NNH08AH37I, NNX08AQ91G]; Center for Integrated Space Weather Modeling (CISM); STC of the National Science Foundation [ATM-0120950]; National Science Foundation |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3198]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 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.(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. |
入库方式： OAI收割
来源：国家空间科学中心
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