Abstract
Long‐range propagation in the Arctic is characterized by a refractive surface duct with a rough boundary. Below 100 Hz, experimental attenuation values are more than a factor of 2 greater than estimates based on scatter theory for statistically homogeneous surfaces and small roughness parameter. The more realistic composite model consisting of random patches having one of two different degrees of roughness does not appear to account for the discrepancy per se. As a step to investigate the apparent inadequacy of the theory, we examine the properties of a model realization—a simulated surface composed of random overlapping ellipsoidal bosses. [Work supported by NUSC.]
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