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Meteor trail characteristics observed by high time resolution lidar
Liu, Y. J.; Plane, J. M. C.; Clemesha, B. R.; Wang, J. H.; Cheng, X. W.; Liu, YJ (reprint author), Inst Nacl Pesquisas Espaciais, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos, Brazil.
Department空间科学部
Source PublicationANNALES GEOPHYSICAE
2014
Volume32Issue:10Pages:1321-1332
ISSN0992-7689
Language英语
KeywordAtmospheric Composition And Structure Middle Atmosphere Composition And Chemistry
AbstractWe report and analyse the characteristics of 1382 meteor trails based on a sodium data set of similar to 680 h. The observations were made at Yanqing (115.97 degrees E, 40.47 degrees N), China by a ground-based Na fluorescence lidar. The temporal resolution of the raw profiles is 1.5 s and the altitude resolution is 96 m. We discover some characteristics of meteor trails different from those presented in previous reports. The occurrence heights of the trails follow a double-peak distribution with the peaks at similar to 83.5 km and at similar to 95.5 km, away from the peak height of the regular Na layer. 4.7% of the trails occur below 80 km, and 3.25% above 100 km. 75% of the trails are observed in only one 1.5 s profile, suggesting that the dwell time in the laser beam is not greater than 1.5 s. The peak density of the trails as a function of height is similar to that of the background sodium layer. The raw occurrence height distribution is corrected taking account of three factors which affect the relative lifetime of a trail as a function of height: the meteoroid velocity (which controls the ratio of Na / Na+ ablated); diffusional spreading of the trail; and chemical removal of Na. As a result, the bi-modal distribution is more pronounced. Modelling results show that the higher peak corresponds to a meteoroid population with speeds between 20 and 30 km s(-1), whereas the lower peak should arise from much slower particles in a near-prograde orbit. It is inferred that most meteoroids in this data set have masses of similar to 1 mg, in order for ablation to produce sufficient Na atoms to be detected by lidar. Finally, the evolution of longer-duration meteor trails is investigated. Signals at each altitude channel consist of density enhancement bursts with the growth process usually faster than the decay process, and there exists a progressive phase shift among these altitude channels.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4461
Collection空间科学部
Corresponding AuthorLiu, YJ (reprint author), Inst Nacl Pesquisas Espaciais, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos, Brazil.
Recommended Citation
GB/T 7714
Liu, Y. J.,Plane, J. M. C.,Clemesha, B. R.,et al. Meteor trail characteristics observed by high time resolution lidar[J]. ANNALES GEOPHYSICAE,2014,32(10):1321-1332.
APA Liu, Y. J.,Plane, J. M. C.,Clemesha, B. R.,Wang, J. H.,Cheng, X. W.,&Liu, YJ .(2014).Meteor trail characteristics observed by high time resolution lidar.ANNALES GEOPHYSICAE,32(10),1321-1332.
MLA Liu, Y. J.,et al."Meteor trail characteristics observed by high time resolution lidar".ANNALES GEOPHYSICAE 32.10(2014):1321-1332.
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