Abstract: In Order to observe stratospheric gravity waves and turbulence, a Gill-type anemometer was improved by using sapphire pivot bearings and photocouplter tachometers. The anemometer has a threshold velocity of less than 1 m ...

Abstract: Vertical-velocity measurements made by a direct vertical-beam method are compared to vertical velocities derived from VAD (velocity-azimuth display) measurements over a 27-h period. The results indicate that the two types ...

Abstract: Analysis of vertical velocity measurements made for four days each month over the period from 1986 to 1988 by the MU radar in Japan shows a reversal in direction near the peak in the zonal wind profile during the winter ...