Abstract
We investigated the fine structures of lower thermospheric atomic oxygen and electron density profiles obtained by a rocket experiment, assuming that these structures are due to a quasi-monochromatic internal gravity wave. The dissipation process of a gravity wave was inferred from the atomic oxygen profile. The height variation of the horizontal wind amplitude is similar to that of the intrinsic horizontal phase speed below ∼105 km, implying an evidence of saturation effects. At higher altitudes, dissipation due to molecular diffusion was suggested. The propagation direction of the wave was determined from both atomic oxygen and electron profiles based on the fact that the response of ionic species to gravity waves is different from that of neutral species depending on the propagation direction. The propagation direction inferred is interpreted as a consequence of selective transmission of gravity waves in lower atmosphere.
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