Abstract
The horizontal characteristics of 14 gravity waves, two evanescent and 12 internal, were derived from 12-direction simultaneous measurements of the O 2( 1Σ) (0–1) airglow observations of a ground-based instrument, MORTI, during AIDA '89. The method used here is the Lomb-Scargle method for unevenly spaced data. The apparent wave periods were between 45 and 360 min, the horizontal wavelengths between 200 and 2900 km and the apparent horizontal wave speeds between 48 and 282 m/s. Since the fluctuations of the emission rate were much higher than those of temperature, the emission rate is a better diagnostic of gravity wave activity than temperature. The observed ν values, the ratio of emission rate fluctuation to temperature fluctuation, lay between 3.5 and 5.5 and the fluctuations were generally in phase. Comparison with existing experimental and theoretical reports suggests the need for some improvement in theoretical treatments.
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