Tide-induced oscillations in the atmospheric sodium layer

Physics

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Scientific paper

/24-hour lidar observations of the vertical distribution of sodium in the upper atmosphere have been made at various locations. Early measurements at Sa~o José dos Campos /(23°W,46°W) showed strong diurnal and semidiurnal components in the sodium profile, and Batista et al. (J. Geophys. Res. 90 (1985) 3881) interpreted these variations as being the result of tidal modulation of the sodium distribution. In a more recent analysis of measurements made at Urbana, Illinois /(40°N,88°W) States and Gardner (J. Geophys. Res. 104 (1999) 11783) concluded that the variations observed by them were not related to tides, but were the result of solar zenith angle driven changes in photo- and ion chemistry. In this paper, we present simultaneous measurements of meteor winds and sodium density in the 80-110km region. It is shown that the observed vertical oscillations in the sodium isopleths are closely correlated with the meridional winds, confirming our earlier conclusion that the sodium density oscillations are driven by the solar diurnal and semidiurnal tides.

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