Wave-4 structure of the neutral density in the thermosphere and its relation to atmospheric tides

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書誌事項

公開日
2012-12
資源種別
journal article
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/j.jastp.2011.12.002
公開者
Elsevier BV

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説明

Abstract 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 150 km to 500 km. Furthermore, we examine the day-to-day variation of the wave-4 amplitude of the neutral density at 400 km height and its relation with the SE2 and DE3 amplitudes at various heights.

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