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Tuesday, July 14, 2020 | History

2 edition of Generation and propagation of acoustic and gravity waves in the solar atmosphere found in the catalog.

Generation and propagation of acoustic and gravity waves in the solar atmosphere

Robert F. Stein

Generation and propagation of acoustic and gravity waves in the solar atmosphere

by Robert F. Stein

  • 389 Want to read
  • 40 Currently reading

Published in [New York] .
Written in English

    Subjects:
  • Cosmic electrodynamics.,
  • Sound -- Transmission.,
  • Gravity waves.

  • Edition Notes

    Statement[by] Robert F. Stein.
    Classifications
    LC ClassificationsQC809.E55 S7
    The Physical Object
    Paginationvii, 362 l.
    Number of Pages362
    ID Numbers
    Open LibraryOL5051972M
    LC Control Number74013543

    E. E. Gossard, W. H. Hooke, Waves in the Atmosphere: Atmospheric Infrasound and Gravity Waves, Their Generation and Propagation, Elsevier (). Some obvious although infrequent sources of such waves in the atmosphere are tsunamis, hurricanes, earthquakes, and volcano eruptions. Air flows over hills and mountains are a more common generation. Here, and 0 are the asymptotic temperatures in the thermosphere and lower atmosphere, respectively, and N0 is the buoyancy frequency in the lower atmosphere. In the presence of dissipation, λz also increases in the thermosphere by a factor of ∼2–3 when ωIr > N0 and λz > 25 km during active solar .

      Acoustic-gravity waves in the Earth's atmosphere have been studied theoretically and experimentally for more than 60 years. AGWs effectively transfer the energy and the momentum between different atmospheric altitude levels and, thus, they play an important role in the dynamics and in the energy balance of the atmosphere. may be termed "atmospheric gravity waves" for con­ venience; but they differ somewhat from the gravity waves that form on the surface of the seas, and in the atmosphere they merge to some extent with acoustic and tidal waves. Their oscillation and propagation are anisotropic, as a consequence of gravity, and they.

    2 Finite-Difference Modeling of Acoustic and Gravity Waves in a Carbon Dioxide Planetary Atmosphere Governing Equations In this study we use the linearized Navier-Stokes equations for acoustic and gravity wave propagation in an attenuating atmosphere subject to bulk, shear and vibrational relaxation.   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 .


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Generation and propagation of acoustic and gravity waves in the solar atmosphere by Robert F. Stein Download PDF EPUB FB2

Exponential and local Lamb waves in the nonisothermal atmosphere as an obstacle to the acoustic-gravity disturbance propagation up to the ionosphere P.A. Bespalov & O.N. SavinaCited by: 6. Homogeneous wave guide theory is used to derive dispersion curves, vertical pressure distributions, and synthetic barograms for atmospheric waves.

A complicated mode structure is found involving both gravity and acoustic waves. Various models of the atmosphere are studied to explore seasonal and geographic effects on pulse by: A new mechanism for the generation of currents and magnetic fields in solar plasma by fluxes of acoustic waves is proposed.

It is shown that the mechanism is particularly strong in the region where the damping of acoustic waves is caused by nonlinear effects (namely, formation of weak shocks).Author: D.

Ryutov, M. Ryutova. Summary. In order to interpret the observed features of pressure records produced by waves from large explosions in the earth's atmosphere, the writers have obtained numerical solutions of the homogeneous equations governing acoustic-gravity wave propagation in a stratified compressible fluid.

Theoretical dispersion curves and variations of perturbation kinetic energy with altitude are. Internal gravity and acoustic waves in planetary and solar atmospheres, notes compiled and published during the summer of in the course taught at Colorado University Department of Astro.

The existence of acoustic‐gravity waves throughout the atmosphere implies coupling between the lower atmosphere and the upper atmosphere. Transport of both momentum and energy are accompanied by the wave process. The implication of momentum and energy transport on thermospheric dynamics is by: 2 J.

Theurer, P. Ulmschneider and M. Cuntz: Acoustic wave propagation in the solar atmosphere be seen in 1-D simulations that acoustic waves will not be reflected by a steep temperature gradient. But this is only the case because of the very special geometry of purely vertical wave propagation. As soon as the wave propaga.

Acoustic wave propagation in the solar atmosphere by the generation of resonances through shock merging. Cuntz (), calculating time{dependent wave models for Arcturus, J.

Theurer et al.: Acoustic wave propagation in the solar atmosphere. IV 0 0 10 20 30 40 50 60 Stein, R. () Generation of acoustic and gravity waves by turbulence in an isothermal stratified atmosphere. Solar Phys. 2: – CrossRef Google Scholar Stein, R. () Waves in the solar atmosphere.

In this second paper of the series on internal gravity waves (IGWs), we present a study of the generation and propagation of IGWs in a model solar atmosphere with diverse magnetic conditions. A magnetic field free, and three magnetic models that start with an initial, vertical, homogeneous field of 10 G, 50 G, and G.

Acoustic-gravity wave effects during solar eclipses are discussed in detail by Knížová and Mošna []. The sudden cooling effect due to a solar eclipse and its potential to act as a source.

Wave disturbances in the upper atmosphere caused by solar flares, and their connection with variations of the geomagnetic field - NASA/ADS It is shown that flare-induced geomagnetic variations are generated in connection with the transmission of acoustic-gravity waves through elevated-conductivity zones of the E-layer.

Vertical propagation acoustic-gravity waves from atmospheric fronts into the upper atmosphere. A mechanism for the generation of acoustic-gravity waves during thunderstorm formation // Nature. – breaking, and effects of nonlinear gravity waves in the atmosphere // J.

Atmos. Solar-Terr. Phys. Sutmann et al.: Acoustic wave propagation in the solar atmosphere. III various acoustic disturbances imposed on the atmosphere at its lower boundary. We consider the excitation by the following acoustic distur-bances: monochromatic acoustic waves (Sect.3), a spectrum of partial waves (Sect.4), a -function pulse (Sect.5), a sinusoidal.

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 media. A perturbation theory is developed to quantify the relative significance of the gravity and fluid compressibility as well as sensitivity of.

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 with height.

A previous theory by Sretenskii [Izv. Akad. Nauk. SSSR Ser. Geofiz. ()] is found to be incorrect. Abstract. Numerical high-resolution modeling of nonlinear acoustic-gravity waves (AGWs) generated at the Earth's surface and propagating to the thermosphere shows that wave characteristics are depending on modifications in the mean density, temperature, molecular dissipation and composition due to variations of solar activity (SA).

Amplitudes of temperature wave perturbations are generally larger at. Acoustic Gravity Waves. The density of our atmosphere decreases with altitude. This variation in density allows the propagation of transverse density variations called acoustic gravity waves.

Such waves could not exist in a homogeneous fluid. In our heterogeneous atmosphere, the acoustic gravity waves travel parallel to the earth's surface. Amongst atmospheric waves, acoustic-gravity waves, whose periodicities range from minutes (pure acoustic waves) to a few hours (upper limit of gravity waves), constitute the source of most of the short-time ionospheric variability.

Acoustic-gravity waves play an important role in the dynamics and energetics of Atmosphere and Ionosphere. Dear Colleagues, Gravity waves in the atmosphere have a variety of sources, including topography, moist convection, and jet-frontal systems.

The momentum transport by gravity waves is of great importance to the atmospheric circulation, structure and variability, especially in the middle atmosphere.

Acoustic-gravity wave propagation characteristics in 3D radiation hydrodynamic simulations of the solar atmosphere. Dr Bernhard Fleck, European Space Agency (ESA) Abstract. There has been tremendous progress in developing 'realistic' 3D radiation hydrodynamic simulations of the solar atmosphere in the past decade.ensure the reflectionless propagation of acoustic waves in a compressible atmosphere in the gravitational field.

Then, we will consider the application of the devel oped theory to waves propagating vertically upward in 1 Reflectionless Acoustic Gravity Waves in the Earth’s Atmosphere N. S. Petrukhina, E. N. Pelinovskiia,b, and E. K. Batsynaa.The authors simulate numerically the propagation of two-dimensional linear acoustic–gravity waves in an atmosphere with vertically varying stratification and horizontal background winds.

The authors’ goal is to compare the difference in how much energy reaches the lower ionosphere up to an altitude of km, where the atmosphere is assumed.