空间科学学报2025，Vol.45Issue(3)：703-716,14.DOI:10.11728/cjss2025.03.2024-0064
基于激光雷达的中低纬地区上空钠层月变化特征
Monthly Variations Characteristics of Sodium Layer over Mid-low Latitudes Based on Lidar
摘要
Abstract
In 2020,the same equipment and the same laser parameters of sodium fluorescence lidar were used to simultaneously observe the sodium layer over different latitudes.This paper systematically explores the monthly characteristics of the overall sodium layer in two regions in 2020 through the sodi-um layer echo photon data obtained from the observation,and inverts and analyses the raw data to re-veal the geographic differences of the sodium layer at different latitudes.It is found that except August,the average monthly column abundance in Beijing(40.5°N,116.0°E)at mid-latitude is higher than that in Haikou(20.0°N,110.3°E)at low latitude.According to the statistics of special events in 2020,the probability of Sporadic Sodium Layer(SSL)events in Beijing and Haikou is 5.3%and 44.9%respective-ly,and the probability of Double Sodium Layer(DSL)events is 5.3%and 4.3%respectively;the peak al-titude of SSL events in Beijing is located at a higher height throughout the year,and strength factor of SSL reaches the maximum value of 10.6 throughout the year.By comparing the ionosphere data by an ionosonde operated at Danzhou,China(19.5°N,109.1°E),it is found that SSL events above 96.0 km in Haikou have a high correlation with Sporadic E layer(Es).Monthly average peak value of the SSL events in Haikou is higher than that in Beijing,and the peak altitude is the opposite.Comparison be-tween two regions shows that without excluding the special events,the monthly trend of sodium layer in Beijing is more regular than that in Haikou.SSL events in Haikou are more frequent,DSL events are more concentrated in Beijing,and they are extremely frequent in May,which may be the result of the modulation of Es and other factors.The average peak altitude of the secondary sodium layer of DSL events in both regions are located near 110 km.This work can further refine our understanding of the behavioral characteristics of sodium layers,providing reference data and conclusions for future research on sodium layers.关键词
钠层/激光雷达/密度峰值/突发钠层/双钠层Key words
Sodium layer/Lidar/Density peak value/Sporadic sodium layer/Double sodium layer分类
天文与地球科学引用本文复制引用
柴薇薇,张铁民,何诗敏,张一民,羊大立,彭鸿雁,王继红..基于激光雷达的中低纬地区上空钠层月变化特征[J].空间科学学报,2025,45(3):703-716,14.基金项目
海南省自然科学基金项目资助(121MS0770,121RC535) （121MS0770,121RC535）
