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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 6
Ann. Geophys., 27, 2247–2257, 2009
https://doi.org/10.5194/angeo-27-2247-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 2247–2257, 2009
https://doi.org/10.5194/angeo-27-2247-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Jun 2009

08 Jun 2009

A statistical study of sporadic sodium layer observed by Sodium lidar at Hefei (31.8° N, 117.3° E)

X.-K. Dou1,2, X.-H. Xue1,2, T.-D. Chen1, W.-X. Wan3, X.-W. Cheng4, T. Li1, C. Chen1, S. Qiu1, and Z.-Y. Chen5 X.-K. Dou et al.
  • 1School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China
  • 2Mengcheng National Geophysical Observatory, Mengcheng, China
  • 3Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  • 4Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, China
  • 5Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

Abstract. Sodium lidar observations of sporadic sodium layers (SSLs) during the past 3 years at a mid-latitude location (Hefei, China, 31.8° N, 117.3° E) are reported in this paper. From 64 SSL events detected in about 900 h of observation, an SSL occurrence rate of 1 event every 14 h at our location was obtained. This result, combined with previous studies, reveals that the SSL occurrence can be relatively frequent at some mid-latitude locations. Statistical analysis of main parameters for the 64 SSL events was performed. By examining the corresponding data from an ionosonde, a considerable correlation was found with a Pearson coefficient of 0.66 between seasonal variations of SSL and those of sporadic E (Es) during nighttime, which was in line with the research by Nagasawa and Abo (1995). From comparison between observations from the University of Science and Technology of China (USTC) lidar and from Wuhan Institute of Physics and Mathematics (WIPM) lidar (Wuhan, China, 31° N, 114° E), the minimum horizontal range for some events was estimated to be over 500 km.

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