Modified ray-mode (phase) theory: Understanding counter-wind propagation effects from atmospheric explosions

Details Modified ray-mode (phase) theory: Understanding counter-wind propagation effects from atmospheric explosions Modified ray-mode (phase) theory: Understanding counter-wind propagation effects from atmospheric explosions

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..241r&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 2-3, p. 241-261.

Computer Science

Sound

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Ray-Mode (Phase) Propagation Theory, Acoustic-Gravity Wave And Infrasound Propagation From Atmospheric Explosions, Refraction, Diffraction And Scattering Of Acoustic-Gravity Waves In The Atmosphere, Middle Atmospheric Structural Parameters Including Temperature, Sound Speed, Atmospheric Resonant Frequencies, Atmospheric Turbulence And Internal Gravity Waves, And Mean Horizontal Wind Motions

Scientific paper

We have incorporated horizontal winds into ray-mode theory including the full spectrum of acoustic-gravity waves for a perfectly stratified, range-independent, steady-state model atmosphere for frequencies from 10-4 to ~10 Hz. This approach has also been applied to a specific atmospheric propagation problem that has long defied a solution, namely counter-wind propagation arrivals at a location ~300 km up-wind of the source. Our modified ray-mode theory predicts reliable up-wind solutions, but only if small-scale sound speed fluctuations were added to the mean seasonal sound speed profiles. Since full-waveguide theory and modified ray-mode mode theory incorporate diffraction and scattering propagation effects, we have performed additional analyses to determine the mechanism through which these fluctuations produce the up-wind signals. We have concluded that the dominant mechanism is through diffraction due to the presence of semi-permanent turbulence and internal gravity waves located near the stratopause.

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