RADIATIVE FORCES ACTING ON POINT SOURCES MOVING IN A STRATIFIED FLUID

Both components of the total radiative force acting on uniformly movin g mass sources in a stratified incompressible fluid are calculated. Th ese forces are related to the emission of internal gravity waves. One component of the radiative force is directed opposite to the direction of motion. This is the well-known wave drag force. Different useful r epresentations of this component are derived for several typical point sources (monopole, dipole, and others). The other component, directed perpendicular to the direction of the motion, is calculated for the f irst time. The results obtained are extended to the case of rotating m edia, where internal inertial-gravity waves exist. (C) 1997 American I nstitute of Physics.