Abstract
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 s−1 in the middle stratosphere, and the performance is very stable for mechanical shocks and temperature variations. The first observational flight of the anemometer was successfully carried out in September 1982. The most interesting result of this observation is that there often exist gust-like wind fluctuations of 1–3 m s−1 in the stratosphere.
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