@Article{LiuPlaCleWanChe:2014:MeTrCh,
author = "Liu, Y. J. and Plane, J. M. C. and Clemesha, Barclay Robert and
Wang, J. H. and Cheng, X. W.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {University
of Leeds} and {Instituto Nacional de Pesquisas Espaciais (INPE)}
and Center for Space Science and Applied Research, Chinese Academy
of Sciences and Wuhan Institute of Physics and Mathematics,
Chinese Academy of Sciences",
title = "Meteor trail characteristics observed by high time resolution
lidar",
journal = "Annales Geophysicae",
year = "2014",
volume = "32",
number = "10",
pages = "1321--1332",
keywords = "atmospheric chemistry, atmospheric structure, lidar, meteor,
modeling, China.",
abstract = "We report and analyse the characteristics of 1382 meteor trails
based on a sodium data set of <680 h. The observations were made
at Yanqing (115.97° E, 40.47° 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 <83.5 km and at <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 <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.",
doi = "10.5194/angeo-32-1321-2014",
url = "http://dx.doi.org/10.5194/angeo-32-1321-2014",
issn = "0992-7689",
label = "scopus 2014-11 LiuPlaCleWanChe:2014:MeTrCh",
language = "en",
targetfile = "Liu_Meteor.pdf",
urlaccessdate = "17 abr. 2024"
}