Study on the long-term trend of sodium atomic density and height distribution in the mid-latitude MLT region(2010-2021)
The mesosphere/lower thermosphere(MLT)region is between 70 and 110 km.To investigate the influence of solar activity on the MLT region,an analysis was conducted on the sodium(Na)density data obtained from Lidar measurements.The data was collected from January 2010 to August 2021 at Yanqing station(116.0°E,40.5°N)near Beijing.We found that the long-term trend of Na column abundance positively correlated with sunspot number.Nevertheless,the observed data did not indicate a substantial trend in the centroid height of the Na layer.Since 2018,there has been an observed increase in the full width half maximum(FWHM)of the Na layer.However,the topmost boundary of the Na layer has remained relatively stable over this period.Currently,the observation and research of the thermosphere metal layer,a subject of considerable interest,mostly relies on enhancing the detection sensitivity of Lidar.
LidarSodium layerSolar activityThe centroid height of sodium layerUpper boundary of sodium layer
万方数据
