A Double Sodium Layer(DSL) structure was observed during the night of August 22, 2011 over Haikou,China(20°N,110°E) by Na lidar.This DSL comprised a typical sodium layer at altitudes of 80～105km and a highe...A Double Sodium Layer(DSL) structure was observed during the night of August 22, 2011 over Haikou,China(20°N,110°E) by Na lidar.This DSL comprised a typical sodium layer at altitudes of 80～105km and a higher sodium layer at altitudes of 105～115km in about 0.5 h.A wavelength of 589 nm dye laser pumped by a Nd:YAG laser was used to make the measurement. The backscattered fluorescence photons from the sodium layer were collected by a telescope with a primary mirror of 1000 mm in diameter.The sodium density of these layers during the nighttime observation in the Mesosphere and Lower-Thermosphere(MLT) was studied.展开更多
基金Supported by High Education Research of the Education Department of Hainan Province(Hjkj2012-21)Specialized Research Fund for State Key Laboratories(Y02211J82S,Y02211A49S)
文摘A Double Sodium Layer(DSL) structure was observed during the night of August 22, 2011 over Haikou,China(20°N,110°E) by Na lidar.This DSL comprised a typical sodium layer at altitudes of 80～105km and a higher sodium layer at altitudes of 105～115km in about 0.5 h.A wavelength of 589 nm dye laser pumped by a Nd:YAG laser was used to make the measurement. The backscattered fluorescence photons from the sodium layer were collected by a telescope with a primary mirror of 1000 mm in diameter.The sodium density of these layers during the nighttime observation in the Mesosphere and Lower-Thermosphere(MLT) was studied.
文摘使用Nd:YAG激光器和泵浦染料激光器产生的589 nm激光,与中高层大气中钠原子产生共振,利用直径为1000 mm的望远镜接收钠层的光子回波.研究中国海口市2010年5月4日夜间的中高层大气中钠层密度分布,计算钠层的相对密度和绝对密度,研究钠层密度峰值变化.观测到突发钠层出现在23:52 LT,持续12 min.
