During the EASOE campaign, measurements were made of temperature and different minor constituents, with the help of instrumented balloons. The vertical profiles nearly always show small scale structures. Here we show that on two different days a large part of these small scale structure can be explained by the transport induced by waves. The roˆle of waves is supported by a good correlation found between the small scale structure of the minor constituents profiles and the temperature profile. Furthermore on 11 December 1991 lidar measurements show the trace of a wave on a polar stratospheric cloud (Godin et al. 1993). Comparison of some of its characteristics with what was found in water vapour and ozone measurement profiles carried out the same day, confirm the roˆle of the wave in the minor constituent fluctuations. ¿American Geophysical Union 1994