Volume 37 Issue 4
Jul.  2017
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ZHANG Tiemin, WANG Jihong, WANG Linmao, CHEN Xueming, WU Jianqing, ZOU Xu, PENG Hongyan. Observations of Sodium Layer over Beijing and Haikou in July 2012[J]. Journal of Space Science, 2017, 37(4): 424-431. doi: 10.11728/cjss2017.04.424
Citation: ZHANG Tiemin, WANG Jihong, WANG Linmao, CHEN Xueming, WU Jianqing, ZOU Xu, PENG Hongyan. Observations of Sodium Layer over Beijing and Haikou in July 2012[J]. Journal of Space Science, 2017, 37(4): 424-431. doi: 10.11728/cjss2017.04.424

Observations of Sodium Layer over Beijing and Haikou in July 2012

doi: 10.11728/cjss2017.04.424
  • Received Date: 2016-05-03
  • Rev Recd Date: 2017-03-28
  • Publish Date: 2017-07-15
  • 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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