| 2012年7月海口与北京大气钠层观测 |
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| 引用本文： | 张铁民,王继红,王林茂,陈学明,吴建清,邹旭,彭鸿雁.2012年7月海口与北京大气钠层观测[J].空间科学学报,2017,37(4):424-431. |
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| 作者姓名： | 张铁民 王继红 王林茂 陈学明 吴建清 邹旭 彭鸿雁 |
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| 作者单位： | 1. 海南师范大学物理与电子工程学院 海口 571158; |
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| 基金项目： | 国家自然科学基金项目（41364005，41564006）和海南省自然科学基金项目（20164163）共同资助 |
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| 摘 要： | 2012年7月海南激光雷达站（20°N，110°E）和北京激光雷达站（40°N，116°E）同时进行观测，对比低纬和中纬度中高层大气钠层分布及密度变化特性.两地使用相同的Nd:YAG激光器和泵浦染料激光器产生589nm激光，设定相同的激光参数，使用相同的直径1000mm的望远镜接收钠层的光子回波.两地均观测到突发钠层和双钠层事件.其中:海口观测到突发钠层事件9个，双钠层事件1个；北京观测到突发钠层事件1个，双钠层事件4个.分析海口和北京同一天夜间观测的大气钠层特性，对比两地同时观测到的钠层高度与密度的不同变化，发现当天夜间低纬度地区海口市上空钠层出现双钠层结构，持续时间123min，但是北京上空钠层没有发现该结构.
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| 关 键 词： | 激光雷达 中高层大气 钠层密度 大气光学 |
| 收稿时间： | 2016-05-03 |
Observations of Sodium Layer over Beijing and Haikou in July 2012 |
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| Affiliation: | 1. College of Physics and Electronic Engineering, HaiNan Normal University, Haikou 571158;2. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190 |
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| Abstract: | The observations were conducted by lidar over Haikou (20°N, 110°E) and Beijing (40°N, 116°E) in July 2012. The basic characteristics of the sodium layer density at a low-latitude and mid-latitude location are analyzed by the observations. The double sodium layer events and sporadic layer were observed over Beijing and Haikou. A Nd:YAG laser and a pumped dye laser are used to generate the probing beam. The wavelength of the dye laser is set to be 589nm by a sodium fluorescence cell. The energy and divergence of the beam are set about 45mJ and 1mrad, respectively. The backscattered fluorescence photons from the sodium layer are collected by a telescope with a primary mirror which diameter is equal to 1000mm. There are 9 events of Sporadic Sodium Layer (SSL) and 1 event of Double Sodium Layer (DSL) occurred in Haikou, and 1 event of SSL and 4 events of DSL occurred in Beijing. The variety and distribution of the sodium density over Beijing and Haikou during the night of July 1, 2012 are compared. A DSL structure was observed and it had lasted 120min during the night of July 1, 2012 over Haikou, but no DSL structure occurred over Beijing. |
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