A thermospheric Na layer event observed up to 140 km over Syowa Station (69.0°S, 39.6°E) in Antarctica
A thermospheric Na layer event observed up to 140 km over Syowa Station (69.0°S, 39.6°E) in Antarctica
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DOI：
10.1002/2015gl064101
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发表时间：
2015-05
影响因子：
5.2
通讯作者：
T. Tsuda;X. Chu;T. Nakamura;M. Ejiri;T. Kawahara;A. Yukimatu;K. Hosokawa
中科院分区：
文献类型：
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作者：
T. Tsuda;X. Chu;T. Nakamura;M. Ejiri;T. Kawahara;A. Yukimatu;K. Hosokawa
本文报道了2000年9月23-24日晚在南极洲Syowa（69.0°S，39.6°E）用激光雷达观测到的热层Na层事件（最远达140 km）。热层Na数密度在110-140公里处为2-9 cm−3，比80-110公里处正常层的峰值密度小3个数量级。热层Na层呈波浪状结构，周期为1-2 h。共定位的电离层/极光观测显示，整个夜晚在Syowa上空有零星的E层，事件开始时Syowa南侧周围的电离层/极光活动增强。采用Chu等人（2011）的理论，我们假设热层Na层是从会聚的Na+层中中和的。包络计算显示出与观察结果的良好一致性。
We report a thermospheric Na layer event (up to 140 km) observed by lidar in the night of 23–24 September 2000 at Syowa (69.0°S, 39.6°E), Antarctica. The thermospheric Na number densities were 2–9 cm−3 at 110–140 km, 3 orders of magnitude smaller than the peak density of the normal layer at 80–110 km. The thermospheric Na layers exhibited a wave‐like structure with a period of 1–2 h. 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.