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Chinese Journal of Space Science ›› 2018, Vol. 38 ›› Issue (6): 886-890.

### Observations of the Prominent Sporadic Sodium Layer over Haikou

YANG Dali1, ZHANG Tiemin1, WANG Jihong2, YAN Chunxiao2, 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:2017-05-23 Revised:2018-05-24 Online:2018-11-15 Published:2018-11-30

Abstract:

The prominent Sporadic Sodium Layer (SSL) were observed by the lidar over Haikou (20°N, 110°E) at 02:47LT on Nov. 2, 2011. The peak density of SSL was 37087cm-3, and its Full Width at Half Maximum (FWHM) was 0.9km. The characters of the peak density and altitude before and after the SSL occurrence were analyzed. 222 SSL events were detected in 377 observation days from 2010 to 2013. The SSL occurrence rate is 12.4h at our location, but only one SSL which peak density was beyond 30000cm-3. By comparing the corresponding data of the nearest ionosonde and VHF radar at Danzhou (19.5°N, 109.1°E), it was found that SSL is closely related to Es. Among the 8 pairs of SSL and Es events checked, all peaks of SSL were accompanied by the lowest Es within 5km in altitude, and 6 pairs of them were correlated within ±0.5h in time. A Nd:YAG laser and pumped dye laser were used to generate the probing beam. The wavelength of the dye laser was set to 589nm by a sodium fluorescence cell. The energy and divergence of the beam were 45mJ and 1mrad, respectively. The backscattered fluorescence photons from the sodium layer were collected by a telescope with a 1000mm diameter primary mirror.

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