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Abstract
An analysis is presented of the data obtained from an instrumented balloon rising through a jet stream. Emphasis is placed on the determination of the vertical atmospheric velocity. The analysis of the temperature and velocity perturbations shows evidence of a wave structure propagating upward. An estimation of the vertical flux of horizontal momentum is given. These preliminary results show clearly the ability of our helisonde to measure wave motions with a vertical velocity as low as 0.1 m s-1. The method allows a direct measurement of wave propagation in the stratosphere.