Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3120106v&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 20, CiteID L20106
Physics
4
Electromagnetics: Wave Propagation (4275), Meteorology And Atmospheric Dynamics: Theoretical Modeling, Meteorology And Atmospheric Dynamics: Waves And Tides, Atmospheric Composition And Structure: Pressure, Density, And Temperature, Atmospheric Composition And Structure: General Or Miscellaneous
Scientific paper
Ray tracing for sonic wave propagation in a two-dimensional atmosphere structure is performed in the presence of spatially variable wind by using an Hamiltonian approach. Paraxial ray tracing is deduced by first-order perturbations. Using standard atmospheric data or illustrative models, we test numerically the Hamiltonian approach. The ray tracing allows accurate estimation of trajectories and associated travel-times as well as stable and accurate amplitude variations along a ray. Lateral variations of both sonic and wind velocity are important for quantitative evaluation of acoustic waves. Gradients of the wind field must be taken into account for precise quantification of ray trajectories and, consequently, for the localization of ground impacts, a key element for any micro-barometric recording station.
Blanc Elisabeth
Dessa Jean Xaver
Garnier Nicolas
Virieux Jean
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