Internal Gravity Waves Excited by Motionless Perturbation Sources

In this work the authors construct the asymptotics of solutions describing internal gravity waves excited by a motionless localized perturbation source in a layer of an arbitrarily stratified medium. The analytical expressions for an individual mode in the stratified rotating medium are obtained both far from and near the wave fronts. The estimates for the effect of rotation of the stratified medium as a whole on the main characteristics of far wave fields are presented. The qualitative pattern of propagation of far wave fields is investigated. The peculiarities of wave fields at large time and limited distances are studied. It is shown that the field of internal gravity waves at large times appears to be more localized at a depth of source immersion and relatively distributed over the vertical. The impact of various parameters of the perturbation source nonlocality on the spatial patterns of far fields of internal gravity waves is investigated.