학술논문
中纬度中间层顶钠原子密度高度分布的长期变化趋势研究(2010-2021) / Study on the long-term trend of sodium atomic density and height distribution in the mid-latitude MLT region(2010-2021)
Document Type
Academic Journal
Author
陈峰磊; 荀宇畅; 王泽龙; 杜丽芳; 郑浩然; 徐亦萌; 龚少华; 王继红; 杨国韬; CHEN FengLei; XUN YuChang; WANG ZeLong; DU LiFang; ZHENG HaoRan; XU YiMeng; GONG ShaoHua; WANG JiHong; YANG GuoTao
Source
地球物理学报 / Chinese Journal of Geophysics. 67(2):429-438
Subject
Language
Chinese
ISSN
0001-5733
Abstract
中间层顶/低热层区域(the Mesosphere/Lower Thermosphere,简称MLT)的高度为70～110 km,为了研究这一区域对太阳活动的响应,本文以钠原子为示踪物,对北京延庆(116.0°E,40.5°N)钠共振荧光激光雷达2010年1月-2021年8月近一个太阳活动周期的数据进行了分析,发现钠原子柱密度的长期变化显著,与太阳黑子数的变化呈现出正相关趋势.延庆钠层质心高度的线性趋势在这期间总共上升了 311.4±706.6 m,长期变化趋势并不显著.自2018年开始,半高全宽对应的高度范围出现了明显的增加,但是上边沿升高的幅度不大,目前受到广泛关注的热层金属层的观测与研究更依赖于激光雷达探测灵敏度的提升.
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.
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.