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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.; Dou, XK (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2013
Volume118Issue:5Pages:2409-2418
ISSN2169-9380
Language英语
KeywordThermospheric Sodium Layer Sporadic Sodium Layer Sporadic e
AbstractWe 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.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5059
Collection空间科学部
Corresponding AuthorDou, XK (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China.
Recommended Citation
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..,...&Dou, XK .(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.
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