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Chinese Journal of Space Science ›› 2017, Vol. 37 ›› Issue (4): 424-431.doi: 10.11728/cjss2017.04.424

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Observations of Sodium Layer over Beijing and Haikou in July 2012

ZHANG Tiemin1, WANG Jihong2, WANG Linmao1, CHEN Xueming1, WU Jianqing1, ZOU Xu1, PENG Hongyan1   

  1. 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
  • Received:2016-05-03 Revised:2017-03-28 Online:2017-07-15 Published:2017-07-20

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.

Key words: Lidar, Mesosphere and lower-thermosphere, Sodium layer density, Atmospheric optics

CLC Number: