Abstract
Low‐frequency ambient noise data acquired during Mizex 84 have been analyzed for temporal and spatial variations. Several concurrent time series of rms pressure in the 25‐ to 50‐Hz band sampled at 30‐s intervals and of a few hours in duration were constructed from hydrophone data taken at various separations within a 10‐km range. During noise episodes, a time scale on the order of 10 min has been obtained via autocorrelations. Also, variations in noise level of up to 7 dB between sensors as close as 1/2 km, together with crosscorrelations which are high at separations of 5 km but significantly smaller at half that distance, suggest a spatially banded or striated noise generation process. [Work supported by the Office of Naval Research.]
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