Computer Science – Sound
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp.......965m&link_type=abstract
(IUGG, IAGA, USAF, et al., International Symposium on Equatorial Aeronomy, 7th, Hong Kong, Mar. 22-29, 1984) Journal of Atmosphe
Computer Science
Sound
Gravity Waves, Sound Waves, Thermosphere, Wave Equations, Wave Propagation, Coupling Coefficients, Field Strength, Kinetic Energy, Phase Velocity, Wind Velocity
Scientific paper
A full wave calculation has been made for the acoustic-gravity waves in an inhomogeneous and viscous atmosphere approximated by a number of horizontal thin slabs. A propagation matrix within a slab is assumed to be in the form of a polynomial function of height. In the derivation of a linearized wave equation, the height derivatives of ambient atmospheric parameters are taken into account. It is revealed that the large-scale gravity waves undergo significant partial downward reflections caused by increasing kinematic viscosity in the upper part of the thermosphere, in addition to the well-known total reflection due to the sharp rise of atmospheric temperature near the thermospheric base. As a conseqeunce of these reflections, some part of the wave energy conveyed from the lower ionosphere is trapped within the region around the F2-peak. Efficiency of energy trapping largely depends on the horizontal phase velocity.
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