METEOR RADAR STUDY OF IONOSPHERIC WIND AT KYOTO.

This paper describes the results of meteor radar observations which have been carried out at Kyoto University since December, 1977. The radar, a coherent pulse Doppler radar with a transmitting frequency of 31. 57 MHz and a nominal peak power of 10 kW, is able to detect wind fields at meteor regions of 80-110 km. The solar semidiurnal tide generally dominates the wind oscillations at these heights, while a diurnal tide of comparable magnitude reveals itself in a less regular manner. Some anomalies in the amplitude and phase characteristics of the tides are shown, which might be related to a possible interaction with winds and waves, or to some disturbed conditions in the earth's atmosphere. Also, planetary scale waves such as quasi-2-day oscillations and resonantly magnified gravity-mode waves have been found there. Hence, the meteor radar, in conjunction with other obsrvations, will help in understanding the dynamics of atmospheric waves on a global scale.