空间科学学报2025，Vol.45Issue(1)：102-112,11.DOI:10.11728/cjss2025.01.2024-0035
激光雷达观测研究低纬度地区钠层季节变化特征
Seasonal Variation Characteristics of Sodium Layer in Low Latitude by Lidar
摘要
Abstract
Sodium lidar observations of sodium layer from 2018 to 2019 at a low-latitude location(Haikou,China,20°N,110.3°E)are reported in this paper.The purpose is to reveal characteristics of sea-sonal variations of the sodium layer,including density distribution characteristics,seasonal variation characteristics and special events of sodium layer.According to statistical analysis,there is a great corre-lation between the variation of sodium layer and seasons.Average density of sodium layer presents a ba-sically symmetrical Gaussian distribution,with good morphological symmetry in autumn.Column densi-ty and peak value are small in spring and summer and vice versa in autumn and winter.Peak position is high in summer and low in autumn.There is no clear seasonal variation about the centroid height of the sodium layer.Full Width at Half Maximum(FWHM)and Root Mean Square(RMS)width of sodium layer are both small in autumn and large in winter.Sporadic Sodium Layers(SSLs)change obviously with seasons and the growth,decline and duration time are short in summer and long in spring.Peak value has the minimum in spring and maximum in autumn,respectively.Peak position tends to be high-er during autumn and winter but lower during spring and summer.The intensity is the largest in sum-mer.Except autumn,peak value of other seasons is mostly in the latter half of the night.With respect to the correlation with sporadic E,combining with the ionosphere data obtained by the nearest ionosonde at Danzhou,China(19.5°N,109.1°E),there is a considerable correlation between sporadic E layers(Es)and SSLs above 97 km at low latitude,which is embodied in the time,height and intensity.By statistical analysis of special events,it is found that the probability of SSLs in winter is high and the Double Sodium Layer(DSL)mostly appears in spring and summer at Haikou.关键词
激光雷达/钠层季节变化特点/突发钠层/电离层偶发/双钠层Key words
Lidar/Seasonal variations of sodium layer/Sporadic sodium layer/Sporadic E layer/Double sodium layer分类
天文与地球科学引用本文复制引用
何诗敏,张铁民,柴薇薇,张一民,羊大立,彭鸿雁,王继红..激光雷达观测研究低纬度地区钠层季节变化特征[J].空间科学学报,2025,45(1):102-112,11.基金项目
海南省自然科学基金项目资助(121MS0770,121RC535) （121MS0770,121RC535）
