Propagation of Acoustic-gravity Waves in the Atmosphere PDF Download

Author: Nambath Krishnan Balachandran
Publisher:
ISBN:
Category :
Languages : en
Pages : 202

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Author: Andrew Peter Tilbrook
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Earl E. Gossard
Publisher: Elsevier Science & Technology
ISBN:
Category : Science
Languages : en
Pages : 484

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Author: United States. Environmental Science Services Administration
Publisher:
ISBN:
Category : Gravity waves
Languages : en
Pages : 462

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Author: Allan D. Pierce
Publisher:
ISBN:
Category : Nuclear explosions
Languages : en
Pages : 0

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Author: Lam Tang
Publisher:
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Category :
Languages : en
Pages : 106

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Author: Ahmad Talaei
Publisher:
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Category :
Languages : en
Pages :

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Atmospheric gravity waves play fundamental roles in a broad-range of dynamical processes extending throughout the Earth0́9s neutral atmosphere and ionosphere. In this paper, we present a modified form for the acoustic-gravity wave equation and its dispersion relationships for a compressible and non-stationary atmosphere in hydrostatic balance. Importantly, the solutions have been achieved without the use of the well-known Boussinesq approximation which have been used extensively in previous studies. We utilize the complete set of governing equations for a compressible atmosphere with non-uniform airflows to determine an equation for vertical velocity of possible atmospheric waves. This intricate wave equation is simplified by a proper substitution producing a useful new wave-like equation for acoustic-gravity waves. The substitution introduces a term omega (intrinsic frequency) in the amplitude of the wave solution for the vertical velocity of acoustic-gravity waves. This term may play a significant role in directional filtering of atmospheric waves in realistic atmospheres exhibiting strong and highly variable winds. It is also proven that the only difference in the wave equation of compressible fluid when non-uniform wind is added to the equations of motion is the term with second derivative of Ln(omega) with respect to height. These new solutions may be particularly important for improved gravity wave propagation studies in the upper mesosphere and thermosphere/ionosphere regions.

Author: Stanford University. Stanford Electronics Laboratories
Publisher:
ISBN:
Category : Sound-waves
Languages : en
Pages : 118

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The purpose of this research was to obtain a panoramic view of acoustic-gravity-wave motions throughout the atmosphere. A one-dimensional array of particles and springs, conceived by Newton to study sound waves in the atmosphere, was extended to two dimensions by means of 1500 particles interconnected by springs. Variations of density and pressure with altitude are represented by variations in mass and spring constants. This new model has provided means by which acoustic-gravity-wave motions in the atmosphere are solved on a high-speed digital computer, and a new animated-computer-output technique is used. A motion picture--automatically plotted by the computer, a frame at a time--provides greater detail and perspective of mechanical wave motions in the atmosphere than has ever been obtainable before. Ground-level and 100-km-high explosions were investigated with this computer model, and the resulting transient motions of the atmosphere were displayed by means of a motion picture produced by digital techniques. Computed ground-level barograms resulting from a ground-level explosion compare well with experimental barograms recorded during ground-level nuclear explosions. (Author).

Author: Richard L. Pfeffer
Publisher:
ISBN:
Category : Acoustic radiation pressure
Languages : en
Pages : 38

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Author: Joe E. Thomas
Publisher:
ISBN:
Category : Gravity waves
Languages : en
Pages : 182

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