Note
Fluctuations of acoustic transmission were measured for resolved refracted-refracted ray paths atthree long ranges in the deep ocean (258, 410, 560 krn). A moored broadband source with centerfrequency of 460 Hz transmitted continuously for a period of several days from each range .Received signals were processed to give time histories of complex pulse response. Fluctuationstatistics are computed for the carrier line, the combined multipath signal and for time gatedarrivals associated with predicted paths . Refracted arrivals are identified by ray models andstatistics are computed for resolved paths, unresolved doublets of upgoing and downgoing raysand the combined multipath.