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利用钠荧光散射激光雷达对中层顶（７５～１０５ｋｍ）高度的钠原子层进行探测，以钠原子作为示踪物，通过反演得到了该区域大气密度起伏随高度分布和随时间变化关系．结果表明，中层顶附近大气密度起伏远大于平流层和对流层，在２ｈ内，密度起伏可达５％，３日平均Ｒｉｃｈｏｒｄｓｏｎ数为０．４６．
Sodium sodium scattering laser lidar was used to detect the sodium atomic layer at the top of the middle layer (75 ~ 105km). Using sodium atom as tracer, the relationship between altitude distribution and time distribution of atmospheric density was obtained by inversion. The results show that the density of atmospheric density near the mid-top is much larger than that of the stratosphere and troposphere, and the density fluctuation can reach 5% in 2h, and the average Richordson number on the 3rd is 0.46.