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The intensities of the upper mesospheric airglow emissions, OI5577, O2b(0,1), and OH(6,2), together with the rotational temperature of the OH band, have been observed at an equatorial station, Sao Joao do Cariri (7.4 o S,36.5 o W), during the PSMOS observation period from 1998 to 2001. All of the emissions show distinct semiannual variations, maxima at the equinoxes and minima at the...
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