Long‐Range Atmospheric Infrasonic Propagation

Atmospheric propagation modeling indicates homing pigeons use loft-specific infrasonic 'map' cues.

Results from an acoustic ray-tracing program using daily meteorological profiles are presented to explain 'release-site biases' for homing pigeons at three experimental sites in upstate New York where W. T. Keeton and his co-workers at Cornell University conducted extensive releases between 1968 and 1987 in their investigations of the avian navigational 'map'. The sites are the Jersey Hill and ...

Generation and Propagation of Infrasonic Airwaves from Volcanic Explosions

Analysis of infrasonic pressure waves generated by active volcanoes is essential to the understanding of volcanic explosion dynamics. Unlike seismic waves propagating in the earth, infrasonic airwaves offer a relatively unfiltered representation of source motions at the vent during an eruption. Time-varying acoustic propagation filters caused by changeable atmospheric conditions are minimal for...

Beam criterion for atmospheric propagation.

A criterion is introduced for testing whether a beam retains its beam-like form after it propagates any particular distance through the turbulent atmosphere. The criterion applies to monochromatic as well as to partially coherent beams and is illustrated by examples.

Atmospheric Propagation of Terahertz Radiation

The Effects of Thermal and Wind Fields in the Propagation of Infrasonic Waves in the Atmosphere

Omar Marcillo Sound waves traveling at frequencies between 0.05 and 20 Hertz are called infrasound waves. Ocean waves, meteorites (Evers et al., 2001), large earthquakes, and volcanic eruptions (Johnson, 2003) are among the natural phenomena that produce infrasound waves. Nuclear and chemical explosions can also generate infrasound waves. Infrasound waves tend to travel long horizontal distance...