Lower thermospheric-enhanced sodium layers observed at low latitude and possible formation: Case studies

	Lower thermospheric-enhanced sodium layers observed at low latitude and possible formation: Case studies
	Xue, X. H.; Dou, X. K.; Lei, J.; Chen, J. S.; Ding, Z. H.; Li, T.; Gao, Q.; Tang, W. W.; Cheng, X. W.; Wei, K.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2013
卷号	118 期号:5 页码:2409-2418
关键词	thermospheric sodium layer sporadic sodium layer sporadic E
ISSN号	2169-9380
通讯作者	Dou, XK (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China.
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.
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/5059]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	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.
APA	Xue, X. H..,Dou, X. K..,Lei, J..,Chen, J. S..,Ding, Z. H..,...&Wei, K..(2013).Lower thermospheric-enhanced sodium layers observed at low latitude and possible formation: Case studies.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,118(5),2409-2418.
MLA	Xue, X. H.,et al."Lower thermospheric-enhanced sodium layers observed at low latitude and possible formation: Case studies".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118.5(2013):2409-2418.