Abstract
Preliminary results of analysis of the molecular oxygen nightglow emission rate and rotational temperature observed at Almaty site by the Mesopause Oxygen Rotational Temperature Imager (MORTI) during the 1997–1999 period are discussed. Lomb-Scargle periodogram analysis was applied to assess the statistically significant oscillations present in the data. A quadratic fit was subtracted from each data set to remove trends whose periods were commensurate with the data set length. Two groups of statistically significant peaks appear in the power spectra. A lower frequency group, corresponding to periods of 5–9 hours, most likely due to tidal oscillations or due to gravitational normal modes. And a higher frequency group, corresponding to periods of 1–4 hours, due to internal gravity waves (IGWs) propagation at mesopause heights. The COPHASE method proposed by Posmentier and Herrman (1971) was applied to obtain IGWs characteristics from MORTI data.
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