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Mesosphere/lower thermosphere winds obtained by meteor radar over Cachoeira Paulista (22.7°S, 45.0°W), Brazil, have been used to investigate the interannual variability of the diurnal tidal (DT) wind amplitude. The monthly DT displays year to year variations and their amplitudes are strongest during the westerly phase of the quasi-biennial oscillation (QBO) at the 30 hPa level. This can be observed...
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