The annual variation of the height of the atmospheric sodium layer at 23°S: possible evidence for convective transport

摘要: On the basis of a long series lidar measurements made at Sao Jose dos Campos, it is found that centroid height atmospheric sodium layer about 1 km lower in November than during rest year. Photometric OH(9,4) and OI 557.7 nm airglow intensities, observed nearby location, show these emissions have maximum values this time The hydroxyl emission shows sharp increase intensity by 20% November, atomic oxygen has broader peak October, December. There strong inverse correlation between seasonal variations OH intensity, with coefficient 0.86 regression −89±16 Rayleighs km−1. It suggested anticorrelated could be result changes convective transport thermosphere.