Abstract
A ray-based wave field description is employed in the analysis of measurements made during the November 1994 Acoustic Engineering Test (the AET experiment). In this experiment phase-coded pulse-like signals with 75-Hz center frequency and 37.5-Hz bandwidth were transmitted near the sound channel axis in the eastern North Pacific Ocean. The resulting acoustic signals were recorded on a moored vertical receiving array at a range of 3252 km. In our analysis both mesoscale and internal-wave-induced sound speed perturbations are taken into account. Much of this analysis exploits results that relate to the subject of ray chaos; these results follow from the Hamiltonian structure of the ray equations. It is argued that all of the important features of the measured AET wave fields are consistent with a ray-based wave field description in which ray trajectories are predominantly chaotic. [Work supported by ONR.]
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