海口上空中高层大气强烈的突发钠层观测  

Observations of the Prominent Sporadic Sodium Layer over Haikou

作　　者：羊大立[1] 张铁民[1] 王继红 燕春晓 彭鸿雁[1] YANG Dali;ZHANG Tiemin;WANG Jihong;YAN Chunxiao;PENG Hongyan(College of Physics and Electronic Engineering,Hainan No~nal University,Haikou 571158;State Key Laboratory of Space Weather,National Space Science Center Chinese Academy of Sciences,Beijing 100190)

机构地区：[1]海南师范大学物理与电子工程学院,海口571158 [2]中国科学院国家空间科学中心空间天气学国家重点实验室,北京100190

出　　处：《空间科学学报》2018年第6期886-890,共5页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(41364005)

摘　　要：海南激光雷达站(20°N, 110°E) 2011年11月2日观测到强烈的突发钠层(SSL).该SSL峰值密度达37087Cm^(-3),半峰全宽仅为0.9km.对该SSL发生前后的钠层峰值密度和高度特性进行分析.统计激光雷达2010年5月至2013年12月共计377天观测到的SSL事件222次,其中仅有1次SSL峰值密度超过30000cm^(-3).对比距离最近的海南儋州(19.5°N,109.1°E)测高仪和VHF雷达观测到的突发E层(Es)事件,分析事件的相关性.Es最低高度与SSL峰值高度差均在5 km以内,约有75%的Es与SSL时间差在±30 min之内.实验中使用continuum的Nd:YAG激光器和泵浦染料激光器产生589 nm激光,能量为45mJ,使用直径为1000 mm的望远镜接收钠层的光子回波.The prominent Sporadic Sodium Layer (SSL) were observed by the lidar over Haikou (20°N, 110°E) at 02:47LT on Nov. 2, 2011. The peak density of SSL was 37087cm^-3, and its Full Width at Half Maximum (FWHM) was 0.9 km. The characters of the peak density and altitude before and after the SSL occurrence were analyzed. 222 SSL events were detected in 377 observation days from 2010 to 2013. The SSL occurrence rate is 12.4 h at our location, but only one SSL which peak density was beyond 30 000 cm^-3. By comparing the corresponding data of the nearest ionosonde and VHF radar at Danzhou (19.5°N, 109.1°E), it was found that SSL is closely related to Es. Among the 8 pairs of SSL and Es events checked,all peaks of SSL were accompanied by the lowest Es within 5km in altitude,and 6pairs of them were correlated within ±0.5h in time.A Nd:YAG laser and pumped dye laser were used to generate the probing beam.The wavelength of the dye laser was set to 589nm by a sodium fluorescence cell.The energy and divergence of the beam were 45mJ and I mrad,respectively.The backscattered fluorescence photons from the sodium layer were collected by a telescope with a 1000mm diameter primary mirror.

关 键 词：激光雷达 中高层大气 钠层密度 

分 类 号：P352[天文地球—空间物理学]