Infrasound Radiation of Cyclone

Tropical cyclones produce strong perturbations of atmosphere and the ocean surface accompanying by an acoustical radiation. Infrasonic signals in the 0.1–0.5 frequency band can be observed at a distances of thousands of miles from the cyclone. There are specific features of the mechanism of infrasound radiation by cyclone. The radiated sound can be trapped by atmospheric wave guide. The presence of oversaturated water vapor layer in the upper domain of the cyclone leads to the development of specific nonlinear effects of radiation instability that provides amplification of infrasound radiation.