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In this paper we discuss the mechanisms responsible for the formation of the acoustic wave when a shock interacts with a vortex. Experimental measurements have shown that this interaction produces a primarily quadrupolar acoustic wave with a strong compression attached to the shock front. We review earlier work which shows that this strong compression is due to the distortion of the shock. The origin of the quadrupolar component is examined by comparing two-dimensional computations of thedoi:10.1016/s0169-5983(97)00006-3 fatcat:wefuhupitbhmheygsvyql6cgt4