Interhemispheric asymmetry of the equatorial ionization anomaly in solstices observed by COSMIC during 2007-2012
文献类型：期刊论文
| 作者 | Luan, Xiaoli; Wang, Pan; Dou, Xiankang; Liu, Yong C. -M. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2015 |
| 卷号 | 120期号:4页码:3059-3073 |
| 关键词 | equatorial ionization anomaly interhemispheric asymmetry solar cycle dependence longitudinal variation |
| ISSN号 | 2169-9380 |
| 通讯作者 | Luan, XL (reprint author), Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China. |
| 英文摘要 | The ionospheric radio occultation measurements from Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites during 2007-2012 are utilized to analyze variations of the hemispheric asymmetry in the equatorial ionization anomaly (EIA) in solstice seasons. A hemispheric asymmetry index (A(h)) is introduced to quantitatively characterize the relative interhemispheric asymmetry or north-south differences of the EIA crests. The seasonal, solar activity, and longitudinal dependences of the hemispheric asymmetry are investigated during these low to moderately high solar activity levels. Our main findings are as follows: (1) The transition of stronger crest from the winter to summer hemispheres generally took place during noon to afternoon hours (similar to 11:00-14:00LT), whereas the change of the EIA hemispheric asymmetry pattern toward a stronger summer crest actually started 2-3h earlier. (2) Remarkable differences were observed in the EIA hemispheric asymmetry between June and December solstices. In June solstice, the transition from stronger winter to summer crests occurred later, and consequently, the duration with stronger winter crest lasted longer during the morning period. (3) In the afternoon hours, the magnitudes of relative interhemispheric asymmetry of EIA crests were obviously anticorrelated with the solar activity, while in the morning hours their solar activity dependence was weak. (4) Interhemispheric asymmetry of the crests and its transition time varied with longitudes. It is also found that the longitudinal and seasonal variations of the change rate of A(h) was generally consistent with the corresponding variations of hemispheric asymmetry in ion production rate. Our results indicate that the photochemical process may also play a role in the EIA hemispheric asymmetry, in addition to the important contribution from the transequatorial neutral wind and equatorial fountain effects. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/4597]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Luan, Xiaoli,Wang, Pan,Dou, Xiankang,et al. Interhemispheric asymmetry of the equatorial ionization anomaly in solstices observed by COSMIC during 2007-2012[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(4):3059-3073. |
| APA | Luan, Xiaoli,Wang, Pan,Dou, Xiankang,&Liu, Yong C. -M..(2015).Interhemispheric asymmetry of the equatorial ionization anomaly in solstices observed by COSMIC during 2007-2012.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(4),3059-3073. |
| MLA | Luan, Xiaoli,et al."Interhemispheric asymmetry of the equatorial ionization anomaly in solstices observed by COSMIC during 2007-2012".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.4(2015):3059-3073. |
入库方式： OAI收割
来源：国家空间科学中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。