Simultaneous lidar observation of peculiar sporadic K and Na layers at São José dos Campos (23.1°S, 45.9°W), Brazil |
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Authors: | Jing Jiao Guotao Yang Xuewu Cheng Zhengkuan Liu Jihong Wang Zhenzhong Yan Chi Wang Paulo Batista Alexandre Pimenta Vânia Andrioli CM Denardini |
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Institution: | 1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;2. Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;3. China-Brazil Joint Laboratory for Space Weather, NSSC/INPE, São José dos Campos 12227-010, Brazil;4. Aeronomy Division, Instituto Nacional de Pesquisas Espaciais, 12227-010 São José dos Campos, Brazil |
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Abstract: | We present the first simultaneous observation of mesopause sodium (Na) and potassium (K) layer by a lidar which has Na and K channel simultaneously at the South Hemisphere site, São José dos Campos (23.1°S, 45.9°W). Measurements reported here were conducted on two nights with 3.5 and 8?h of observations in November 2016. On 20 November 2016, sporadic layers in both Na and K layer occurred above 100?km, and the higher layers corresponded well with sporadic E (Es) layer. And the density of Na at 100–105?km is higher than that at main layer around 90?km, but K density around 100?km is at least 3 times smaller compared with the K density around 90?km for the similar period. On 21 November 2016, both sporadic layers occurred in main layer height with obvious descending variations with time, which seems like tidal induced. Notably, the peak K/Na ratio slowly increased with time. And Na layer and K layer showed different processes along with time with K density reaching its maximum 1?h later than that of Na. Correlations of Na/K density, Es, and winds were also discussed. |
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Keywords: | Low-latitude lidar Sodium layer Potassium layer Es Tide |
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