Modified ray-mode (phase) theory: Understanding counter-wind propagation effects from atmospheric explosions |
| |
| Authors: | DO ReVelle |
| |
| Institution: | 1. Departamento de Física Atómica, Molecular y Nuclear, Facultad de Física, Universidad de Sevilla, 41012 Sevilla, Spain;2. Institute of Space Sciences (CSIC-IEEC), Campus UAB, Facultat de Ciències, Torre C5-parell-2ª, 08193 Bellaterra, Barcelona, Spain;3. Instituto de Astrofísica de Andalucía, CSIC, Apt. 3004, Camino Bajo de Huetor 50, 18080 Granada, Spain;1. Facultad de Física, Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, 4012 Sevilla, Spain;2. Facultad de Ciencias Experimentales, Universidad de Huelva, 21071 Huelva, Spain;3. Instituto de Astrofísica de Andalucía, CSIC, Apt. 3004, Camino Bajo de Huetor 50, 18080 Granada, Spain;4. Institute of Space Sciences (CSIC-IEEC), Campus UAB, Facultat de Ciències, Torre C5-parell-2ª, 08193 Bellaterra, Barcelona, Spain;5. Grup d’Estudis Astronòmics (GEA) and Agrupació Astronòmica d’Osona, Barcelona, Spain;1. Dalhousie University, Halifax, Canada;2. Semiconductor Physics Institute, Center for Physical Sciences and Technology, Vilnius, Lithuania;3. Vilnius Gediminas Technical University, Vilnius, Lithuania;1. Il''ichev Pacific Oceanological Institute, 43 Baltiyskaya str., Vladivostok, 690041, Russia;2. Far Eastern Federal University, 8 Sukhanova str., 690950, Vladivostok, Russia |
| |
| Abstract: | 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. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
