Wave-4 structure of the neutral density in the thermosphere and its relation to atmospheric tides
Wave-4 structure of the neutral density in the thermosphere and its relation to atmospheric tides
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DOI：
10.1016/j.jastp.2011.12.002
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发表时间：
2012-12
影响因子：
1.9
通讯作者：
Y. Miyoshi;H. Jin;H. Fujiwara;H. Shinagawa;Huixin Liu
中科院分区：
文献类型：
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作者：
Y. Miyoshi;H. Jin;H. Fujiwara;H. Shinagawa;Huixin Liu
利用大气-电离层耦合模式研究了高空热层中性密度四峰经度结构的产生机制。结果表明，热层高层中性密度的波-4结构是由对流层向东传播的纬向波数为3的全日潮(DE3)和纬向波数为2的东半日潮(SE2)共同作用的结果。赤道地区中性密度的波-4结构主要由DE3产生，而SE2对中纬度波-4结构的产生起重要作用。我们的模拟表明，在150-500公里高度范围内，波-4结构是明显的。此外，我们还研究了400公里高度中性密度波4振幅的逐日变化及其与不同高度SE2和DE3振幅的关系。
The generation mechanism for the 4-peak longitudinal structure of the neutral density in the upper thermosphere is examined using an atmosphere–ionosphere coupled model. Our result indicates that the wave-4 structure of the neutral density in the upper thermosphere is caused by the upward propagation of the eastward diurnal tide with zonal wavenumber 3 (DE3) and the eastward semidiurnal tide with zonal wavenumber 2 (SE2) from the troposphere. The wave-4 structure of the neutral density in the equatorial region is mainly generated by the DE3, while the SE2 is important for the generation of the wave-4 structure in middle latitudes. Our simulation demonstrates that the wave-4 structure is evident at the height range from 150km to 500km. Furthermore, we examine the day-to-day variation of the wave-4 amplitude of the neutral density at 400km height and its relation with the SE2 and DE3 amplitudes at various heights.