Written in EnglishRead online
|Statement||[by] J.D. Cole and C. Greifinger.|
|Series||Rand Corporation. Memorandum RM-5828-ARPA/AFT, Memorandum (Rand Corporation) ;, RM-5828-ARPA/AFT.|
|Contributions||Greifinger, Carl, 1926- joint author.|
|LC Classifications||Q180.A1 R36 no. 5828|
|The Physical Object|
|Pagination||vii, 31 p.|
|Number of Pages||31|
|LC Control Number||74012179|
Download Acoustic-gravity waves from an energy source at the ground in an isothermal atmosphere
Get this from a library. Acoustic-gravity waves from an energy source at the ground in an isothermal atmosphere. [Julian D Cole; Carl Greifinger; Rand Corporation.]. Propagation of Acoustic-Gravity Waves from a Small Source above the Ground in an Isothermal Atmosphere Article (PDF Available) in The Journal of the Acoustical Society of America 35( A theoretical discussion is presented of the influence of gravity on sound propagation from a small source in an isothermal atmosphere where ambient pressure and density decrease exponentially with height.
A solution for the free‐space case is derived that indicates that waves with angular frequency ω between (γ − 1) 1 2 g/c and (γ/2)g/c will not be propagated, while those with ω Cited by: Propagation of Acoustic-Gravity Waves from a Small Source above the Ground in an Isothermal Atmosphere ALLAN D.
PIERCE* The RAND Corporation, Santa Monica, California (Received 12 June ) A theoretical discussion is presented of the influence of gravity on sound propagation from a small source in an isothermal atmosphere where ambient.
Acoustic-gravity waves from an energy source at the ground in an isothermal atmosphere by Julian D Cole (Book) 4 editions published in in English and held by. J.D. Cole, C. GreifingerAcoustic-gravity waves from an energy source at the ground in an isothermal atmosphere Journal of Geophysical Research, 74 (), p.
Google ScholarCited by: Allowing for source heights significantly above ground level (z = 0) in an isothermal, hydrostatic atmosphere where the air pressure decays exponentially according to the local pressure scale height and simultaneously allowing for large scaled range, the aforementioned expression with “C” = “δ” = 1 as discussed earlier in the main body of this chapter, can be simplified using ( Cited by: A theoretical discussion is presented of the influence of gravity on sound propagation from a point source in an isothermal atmosphere, where ambient pressure and density decrease exponentially Acoustic-gravity waves from an energy source at the ground in an isothermal atmosphere book height.
A previous theory by Sretenskii [Izv. Akad. Nauk. SSSR Ser. Geofiz. ()] is Cited by: 2. Infragravity waves are surface gravity waves in the ocean with periods longer than approximately 30 s. Infragravity waves propagate transoceanic distances and, because of their long wavelengths, provide a mechanism for coupling wave processes in the ocean, atmosphere, and the solid Earth.
Here, we present a strict physical justification for the hypothesis that background ocean waves Cited by: After a thorough discussion on the properties of acoustic‐gravity waves in an ideal isothermal atmosphere, the effects produced by horizontal winds, sharp boundary discontinuities, and dissipative processes are discussed.
The generation of these waves by stationary or moving sources is then by: A method of construction of solution for acoustic-gravity waves (AGW) above a wave source, taking dissipation throughout the atmosphere into account (Dissipative Solution above Source, DSAS), is.
LETTER Open Access Acoustic-gravity waves in the atmosphere generated by infragravity waves in the ocean Oleg A Godin1,2*, Nikolay A Zabotin1,3 and Terence W Bullett1,4 Abstract Infragravity waves are surface gravity waves in the ocean with periods longer than approximately 30 s.
A matrix formulation is used to derive the pressure variation for acoustic-gravity waves from an explosive source in an atmosphere modeled by a large number of isothermal layers.
Comparison of theoretical and observed barograms from large thermonuclear explosions leads to the following conclusions: (1) The major features on the barogram can be explained by the superposition of four modes, (2.
Abstract. We have developed a new approach to modeling the acoustic-gravity wave (AGW) radiation from bolide sources. This first effort involves entry modeling of bolide sources that have available satellite data through procedures developed in ReVelle (Earth Moon Plan –, a; in: A.
Milani, G. Valsecchi, D. Vokrouhlicky (eds) NEO Fireball Diversity: Energetics-based Entry Cited by: 4. It is important to study acoustic gravity waves, because the energy fluxes transferred by these waves from the lower to the upper atmospheric layers are comparable with those incoming from the solar radiation (Gokhberg and Shalimov, ), producing a substantial impact on the energy and dynamic bal ance in the atmosphere and, as a consequence.
Time-resolved ducting of atmospheric acoustic-gravity waves by analysis of the vertical energy flux. Yonghui Yu. 1,2. and Michael P. Hickey. 1,2. Received 29 September ; revised 14 November ; accepted 14 December ; published 30 January A new MIT study has examined the possibility of acoustic-gravity waves – high-speed sound waves often generated by underwater earthquakes and landslides – acting as an early warning of.
Acoustic-gravity waves in the atmosphere: Symposium proceedings on *FREE* shipping on qualifying cturer: U.S. Government Printing Office. Acoustic‐gravity waves in the upper atmosphere due to a nuclear detonation and an earthquake. The large nuclear detonation low in the atmosphere over Novaya Zemlya on Octocaused a traveling ionospheric disturbance observed widely on high‐frequency radio sounders.
Both these properties are shown to be a characteristic Cited by: Significant benefits of such a method are, first, its versatility because it handles both acoustic and gravity waves in the same simulation, second, it enables one to observe nonlinear effects as convection or wave-breaking and, finally, it allows one to study the impact of ground-atmosphere coupling for waves propagating from seismic by: 3.
We study the modulation of atmospheric nonisothermality and wind shears on the propagation of seismic tsunami-excited gravity waves by virtue of the vertical wavenumber, m (with its imaginary and real parts, m i and m r, respectively), within a correlated characteristic range of tsunami wave periods in tens of minutes.
A generalized dispersion relation of inertio-acoustic-gravity (IAG) waves Cited by: 1. The reflection properties ofa viscous isothermal atmosphere were examined by Yanowitch , Alkahby and Yanowitch , semitransparent layer allowing part ofthe energy to propagateupward Asaresult, the reflecting layer for small Prandtl number, on upward propagating acoustic waves in an isothermal atmosphereis investigatedbyAlkahby.
OBSERVATIONS OF ACOUSTIC-GRAVITY WAVES IN THE IONOSPHERE GENERATED BY SEVERE TROPOSPHERIC WEATHER Meteorological processes in the troposphere are a source of strong internal waves of a broad period spectrum which carry energy and momentum upward through the atmosphere.
Waves of periods longer than the Brunt-Vaisala period are termed gravity. The propagation of acoustic-gravity waves (AGW) from a source on the Earth's surface to the upper atmosphere is investigated with methods of mathematical modeling.
The applied non-linear model of wave propagation in the atmosphere is based on numerical integration of a complete set of two-dimensional hydrodynamic by: 2. In the studies, a sum of steady-state solutions was assumed to supposedly result in the general solutions to the Navier–Stokes equations and, thus, likely incorrect: in a recent paper, Vadas et al.
studied the excitation of acoustic-gravity waves driven by an ocean surface wave packet in an idealized isothermal, windless and inviscid by: 6.
Acoustic-gravity waves — a special type of sound wave that can cut through the deep ocean at the speed of sound — can be generated by underwater earthquakes, explosions, and landslides, as well as by surface waves and meteorites. The propagation of pressure waves in a stratified, non-isothermal atmosphere is studied in the linear approximation.
It is found that acoustic and acoustic-gravity waves can be horizontally guided by the effect of the Earth’s thermocline alone, under very mild conditions on the temperature gradient steepness.
The effect of the Earth’s surface is also : L. Canella, B. Costantini, G. Nalesso, A. Jacobson. He then looked into whether acoustic-gravity waves may cause water to drift long distances, or if they simply recirculate them back to their original location.
Kadri worked the equation out for acoustic-gravity waves at various depths in the deep ocean, and found that these waves can transport water at a velocity of a few centimeters per second. The phases and amplitudes of gravity waves propagating and dissipating in the thermosphere: Application to measurements over Alaska M.
Nicolls,1 S. Vadas,2 J. Meriwether,3 M. Conde,4 and D. Hampton4 Received 18 January ; revised 21. “This is incredible, just to think that these waves are so different,” Kadri says. “Having them sharing energy is really exciting; this explains how some of the energy that comes from the atmosphere, from the sun and the wind, to the upper part of the ocean, can actually be driven to roll in the deep ocean through acoustic-gravity waves.”.
wind serves the wave energy and allows to carry wave system over great horizontal distance without significant leakage. The conditions for ducting is found to be quite different from the TG relation. In section 4, the dispersion relationships for acoustic-gravity waves in a moving atmosphere with constant vertical wavenumber is : Ahmad Talaei.
dtic ad propagation of acoustic-gravity waves from a small source above the ground in an isothermal atmosphere May 7, 05/20 by Defense Technical Information Center.
Acoustic-Gravity Waves in the Atmosphere, Symposium Proceedings, Boulder, CO,July [T. Georges (ed.)] on *FREE* shipping on qualifying offers. Acoustic-Gravity Waves in the Atmosphere, Symposium Proceedings, Boulder, CO,July Author: T. Georges (ed.). These waves are dispersive acoustic-gravity waves, composed of various modes that propagate in the atmosphere under the effects of gravity and compressibility.
At the higher end of the spectrum there are infrasound waves, which propagate along acoustic rays determined by the temperature and wind profile in the atmosphere, almost free from the.
MHD Waves in the Solar Atmosphere Bernard Roberts. This volume presents a full mathematical exposition of the growing field of coronal seismology which will prove invaluable for graduate students and researchers alike.
Roberts' detailed and original research draws upon the principles of fluid mechanics and electromagnetism, as well as. The system of eq. describes simultaneously the propagation of both acoustic and gravity waves in a viscous fluid subject to that in order to establish eq.
(), we did not use the stratified atmosphere assumption (iv) for density, adiabatic sound speed, viscosity nor gravity but only for wind means that any 3-D varying profile of atmosphere can be considered for background Cited by: 6. the structure of the atmosphere.
(For a sum- mary of early papers see Wilkes .) Interest in this problem was renewed with the detonation of thermonuclear bombs in the atmosphere. These 'megaton'-class explosions ex- cited long atmospheric waves and provided data from a.
A theory of guided propagation of sound in layered, moving fluids is extended to include acoustic-gravity waves (AGWs) in waveguides with piecewise continuous parameters. The orthogonality of AGW normal modes is established in moving and motionless by: AGW - Acoustic Gravity Wave.
Looking for abbreviations of AGW. It is Acoustic Gravity Wave. Acoustic Gravity Wave listed as AGW. Acoustic Gravity Wave - How is Acoustic Gravity Wave abbreviated.
"This is one of the reasons why researchers have mostly overlooked acoustic gravity waves," he notes. Acoustic Gravity Wave; Acoustic Ground. Infrasonic signals are sub-audible quasi longitudinal, atmospheric waves in the frequency band from about 10 Hz to -5 minutes in period (limited by human acoustic audibility in the high frequency limit and by the wave-guide acoustic cut-off frequency and the Brunt Vaisalla frequency in the low frequency limit) These small amplitude waves are a.
A gravitational wave* is a concept predicted by Einstein's theory of general relativity. General relativity states that mass distorts both space and time in the same way a heavy bowling ball will distort a trampoline.
due to losing energy from emitting gravitational waves.The Representation of Gravity Waves in Atmospheric General Circulation Models (GCMs) Inversion of Infrasound Signals for Passive Atmospheric Remote Sensing. (source: Nielsen Book Data) Summary The use of infrasound to monitor the atmosphere has, like infrasound itself, gone largely unheard of through the years.Rossby Waves Frictionally Driven Secondary Circulation Vertical Convection Waves on an Interface Acoustic-Gravity Waves is greater than the most probable energy.
The Atmosphere in Equilibrium We are now in a position to investigate the effect of the earth‘s field of gravity on the energy or velocity distribution of.