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Characteristics of the diurnal tide in the Antarctic mesosphere and lower\udthermosphere (MLT) are investigated using 10 years of medium frequency (MF)\udradar data from Syowa Station (69° S, 39.6° E). Seasonal\udvariations and height dependence of the diurnal amplitude and phase of zonal\udand meridional winds are mostly consistent with previous studies using the\udother Antarctic station data. The meridional momentum flux due to the diurnal\udtide shows a seasonal variation clearly different between above and below 90\udkm, which has never been reported in the literature. Finally, a cause of some\uddiscrepancy in the characteristics of the diurnal tide between the\udobservation and simulation (i.e., GSWM-02) is discussed. It implies that the\udrealistic representation of gravity waves in the simulation is crucial for\udrealistic modeling of the diurnal tide

MF radar observations of the diurnal tide over Syowa, Antarctica (69° S, 40° E)