Quasi-particle method for propagation in inhomogeneous media
Article first published online: 7 DEC 2012
Copyright 1984 by the American Geophysical Union.
Volume 19, Issue 5, pages 1139–1144, September-October 1984
How to Cite
1984), Quasi-particle method for propagation in inhomogeneous media, Radio Sci., 19(5), 1139–1144, doi:10.1029/RS019i005p01139.(
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 17 APR 1984
- Manuscript Received: 29 DEC 1983
In the conventional geometric-optic approximation to wave propagation excited by a source of finite extent, each source point emits rays that transport wave energy along well-defined trajectories, but with transport properties exhibiting singularities in caustic regions where the cross section of ray bundles vanishes. In the first-order quasi-particle approximation the extended source is viewed as a phase space distribution of point quasi-particles whose space-time dependent kinetic properties such as density, average velocity, etc., provide nonsingular measures of the space-time transport of amplitude, wave number, frequency, etc., of the wave train modulation even in caustic regions. The range of ap- plicability of the quasi-particle method is examined in terms of relative space-time scales characteristic of the excitation and medium.