A thermospheric Na layer event observed up to 140km over Syowa Station (69.0 degrees S, 39.6 degrees E) in Antarctica

作者：Tsuda T T^*; Chu X; Nakamura T; Ejiri M K; Kawahara T D; Yukimatu A S; Hosokawa K

来源：Geophysical Research Letters, 2015, 42(10): 3647-3653.

DOI：10.1002/2015GL064101

• lidar
• Na layer
• thermosphere
• high latitude
• Syowa

We report a thermospheric Na layer event (up to 140km) observed by lidar in the night of 23-24 September 2000 at Syowa (69.0 degrees S, 39.6 degrees E), Antarctica. The thermospheric Na number densities were 2-9cm(-3) at 110-140km, 3 orders of magnitude smaller than the peak density of the normal layer at 80-110km. The thermospheric Na layers exhibited a wave-like structure with a period of 1-2h. The colocated ionospheric/auroral observations showed sporadic E layers over Syowa through the night and an enhancement of the ionospheric/auroral activity around south side of Syowa at the event beginning. Adopting the theory by Chu et al. (2011), we hypothesize that the thermospheric Na layers are neutralized from converged Na+ layers. An envelope calculation shows good consistency with the observations.

• 出版日期2015-5-28
• 单位中国极地研究中心