A comparison of optical and radar measurements of mesospheric winds and tides

Optical measurements of mesospheric winds by Fabry-Perot spectrometers, FPS s, at Mawson, 67.6 degrees S 62.9 degrees E, and Davis, 68.6 degrees S 78.0 degrees E, Antarctica are compared with similar measurements obtained usin g a spaced-antenna MF radar at Davis. The FPSs observed the OH emission. Di fferent analysis procedures, used to determine the mean wind, and amplitude and phase of the semidiurnal tide, have been compared. At these latitudes the diurnal tide is weak and the semi-diurnal tide, although highly variabl e in amplitude, is usually the dominant periodicity. When comparing the amp litude and phase of the semidiurnal tide good agreement is obtained between measurements by the two instruments.