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题名:
Lower thermospheric-enhanced sodium layers observed at low latitude and possible formation: Case studies
作者: Xue, X. H.1,2; Dou, X. K.1,3; Lei, J.1,2; Chen, J. S.3,4,5; Ding, Z. H.5; Li, T.1,2; Gao, Q.1,2; Tang, W. W.1,2; Cheng, X. W.6; Wei, K.7
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
出版日期: 2013-05-01
卷号: 118, 期号:5, 页码:2409-2418
关键词: thermospheric sodium layer ; sporadic sodium layer ; sporadic E
文章类型: Article
英文摘要: We report two lower thermospheric-enhanced sodium layer (TeSL) cases observed at a low-latitude station, Lijiang, China (26.7 degrees N, 100.0 degrees E), on 10 March and 10 April 2012, respectively. The TeSLs in the two cases were located at altitudes near 122 and 112km, respectively. In addition, strong sporadic sodium layers (SSLs) near 100km accompanied the TeSL observed on 10 March 2012. Both the TeSLs and SSLs exhibited tidal-induced downward motion. The adjacent ground-based and space-borne ionospheric radio observations showed strong E-s layers before the appearance of the TeSLs, suggesting an E-s- TeSLs (SSLs) chain formed through the tidal wind shear mechanism. Assuming that the vertical tidal wavelengths remain unchanged, it is found that in different regions caused by the tidal wind shear, different TeSLs evolution processes are expected: (1) in a tidal-convergence region, a TeSL/SSL with a downward propagation phase is enhanced due to a rapid decrease in the Na(+)lifetime at the lower altitude; (2) in an ion convergence-divergence interface region, a TeSL/SSL will still follow the tidal downward phase progression, but sodium density does not exhibit evident enhancement; and (3) when a TeSL/SSL enters into a tidal wind-divergence zone, the layer density tends to decrease.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SPORADIC-E ; LIDAR OBSERVATIONS ; MESOPAUSE REGION ; ARECIBO ; EVENT ; NA
收录类别: SCI
语种: 英语
WOS记录号: WOS:000325215800050
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ioe.ac.cn/handle/181551/1175
Appears in Collections:光电技术研究所被WoS收录文章_期刊论文

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作者单位: 1.Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, Sch Earth & Space Sci, Mengcheng Natl Geophys Observ, Hefei 230026, Anhui, Peoples R China
3.Chinese Acad Sci, State Key Lab Space Weather, Beijing, Peoples R China
4.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China
5.China Res Inst Radiowave Propagat, Natl Key Lab Electromagnet Environm, Qingdao, Peoples R China
6.Chinese Acad Sci, Wuhan Inst Phys & Math, Wuhan, Peoples R China
7.Chinese Acad Sci, Inst Opt & Elect, Chengdu, Peoples R China

Recommended Citation:
Xue, X. H.,Dou, X. K.,Lei, J.,et al. Lower thermospheric-enhanced sodium layers observed at low latitude and possible formation: Case studies[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2013,118(5):2409-2418.
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