Occurrence and characteristics of sporadic sodium layer observed by lidar at a mid-latitude location

Physics

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Scientific paper

Na lidar observations of SSL during the past 5 years at a mid-latitude location (Wuhan, China, /31°N, /114°E) are reported in this paper. From 26 SSL events detected in about 230h of observation, an SSL occurrence rate of 1 event/9h at our location was obtained. This result, combined with that reported by Nagasawa and Abo (Geophys. Res. Lett. 22 (1995) 263) at Tokyo, Japan, reveals that the SSL occurrence can be relatively frequent at some mid-latitude locations. The statistical analyses of main parameters for the 26 SSL events were made, and the results were compared with those previously reported. By examining the corresponding data from a nearby ionosonde, it was found that there was a fairly good correlation between SSL and Es. Of the 18 pairs of SSL and Es events checked, 15 of SSL were accompanied by Es, and 8 pairs of them were correlated within 1h in time and within 5km in altitude. >From the analyses of observed perturbations during SSL development, the role of dynamic processes of atmosphere in the SSL formations were emphasized.

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