TY - JOUR
T1 - Wave-4 structure of the neutral density in the thermosphere and its relation to atmospheric tides
AU - Miyoshi, Yasunobu
AU - Jin, Hidekatsu
AU - Fujiwara, Hitoshi
AU - Shinagawa, Hiroyuki
AU - Liu, Huixin
PY - 2012/12/1
Y1 - 2012/12/1
N2 - 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.
AB - 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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U2 - 10.1016/j.jastp.2011.12.002
DO - 10.1016/j.jastp.2011.12.002
M3 - Article
SN - 1364-6826
VL - 90
SP - 45
EP - 51
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
ER -