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The observed 6-s Na layer data at Beijing (40.2°N, 116°E), China was conducted error analysis and compared with 5-minute Na Lidar data located at Wuhan (30.5° N, 114.4° E), china. It was found that 6-s time resolution fluctuations/change rates of Na atomic density were geophysical phenomenon rather than measurement error. The relative measurement errors between Beijing and Wuhan are comparable around 90 km. Based on the long-duration (longer than 10 hours in an observational night) 6-s Na profiles, power spectral density (PSD) of the Na density fluctuations has been calculated. There exist strong fluctuations at frequencies larger than the typical value (2.5×10 -3  Hz, equivalent to a period of ∼5 min) of the Brunt-Väisälä frequency in the mesopause region.

Error Analysis of High-time-resolution Na Lidar Data and Power Spectrum Density of Mesospheric Na Layer