A statistical study of sporadic sodium layer observed by Sodium lidar at Hefei (31.8° N, 117.3° E)
A statistical study of sporadic sodium layer observed by Sodium lidar at Hefei (31.8° N, 117.3° E)
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DOI：
10.5194/angeo-27-2247-2009
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发表时间：
2009-06
影响因子：
1.9
通讯作者：
X. Dou;X. Xue;Tingdi Chen;W. Wan;Xuewu Cheng;Tao Li;Cao Chen;S. Qiu;Ze Chen
中科院分区：
文献类型：
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作者：
X. Dou;X. Xue;Tingdi Chen;W. Wan;Xuewu Cheng;Tao Li;Cao Chen;S. Qiu;Ze Chen
抽象的。本文报道了近3年来在中纬度地区(合肥、中国、31.8°N、117.3°E)零星钠层的激光雷达观测结果。从观测约900h内探测到的激波，得到了我们所在位置每14h发生一次激波的几率。这一结果与以前的研究相结合，表明在一些中纬度地区，SSL的发生可能相对频繁。对SSL事件的主要参数进行了统计分析。通过对一台电离层探空仪的相应资料进行检验，发现SSL值与夜间零星E(Es)值的季节变化之间存在着很好的相关性，皮尔逊系数为0.66，这与Nagawa和Abo(1995)的研究结果一致。根据中国科学技术大学中国激光雷达和武汉物理数学研究所激光雷达(武汉，中国，北纬31°，东经114°)的观测结果比较，估计有些事件的最小水平距离超过500公里。
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.