Acoustic Wave Propagation in the Sun: Implications for Wave Field and Time-Distance Helioseismology

2003 ◽  
Vol 582 (2) ◽  
pp. L121-L124 ◽  
Author(s):  
C. H. Tong ◽  
M. J. Thompson ◽  
M. R. Warner ◽  
S. P. Rajaguru ◽  
C. C. Pain
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Wave Field ◽  
The Sun ◽  
Acoustic Wave Propagation ◽  
Time Distance

scholarly journals Acoustic wave propagation through solar granulation: Validity of effective-medium theories, coda waves

2020 ◽  
Vol 643 ◽  
pp. A168
Author(s):  
P.-L. Poulier ◽  
D. Fournier ◽  
L. Gizon ◽  
T. L. Duvall
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Wave Field ◽  
Multiple Scattering ◽  
Acoustic Waves ◽  
Wave Speed ◽  
Coda Waves ◽  
Acoustic Wave Propagation ◽  
Solar Granulation ◽  
Effective Wave

Context. The frequencies, lifetimes, and eigenfunctions of solar acoustic waves are affected by turbulent convection, which is random in space and in time. Since the correlation time of solar granulation and the periods of acoustic waves (∼5 min) are similar, the medium in which the waves propagate cannot a priori be assumed to be time independent. Aims. We compare various effective-medium solutions with numerical solutions in order to identify the approximations that can be used in helioseismology. For the sake of simplicity, the medium is one dimensional. Methods. We consider the Keller approximation, the second-order Born approximation, and spatial homogenization to obtain theoretical values for the effective wave speed and attenuation (averaged over the realizations of the medium). Numerically, we computed the first and second statistical moments of the wave field over many thousands of realizations of the medium (finite-amplitude sound-speed perturbations are limited to a 30 Mm band and have a zero mean). Results. The effective wave speed is reduced for both the theories and the simulations. The attenuation of the coherent wave field and the wave speed are best described by the Keller theory. The numerical simulations reveal the presence of coda waves, trailing the ballistic wave packet. These late arrival waves are due to multiple scattering and are easily seen in the second moment of the wave field. Conclusions. We find that the effective wave speed can be calculated, numerically and theoretically, using a single snapshot of the random medium (frozen medium); however, the attenuation is underestimated in the frozen medium compared to the time-dependent medium. Multiple scattering cannot be ignored when modeling acoustic wave propagation through solar granulation.

Acoustic wave propagation in two dimensional sheared ducted flows

1997 ◽  
Author(s):  
E. Longatte ◽  
P. Lafon ◽  
S. Candel ◽  
E. Longatte ◽  
P. Lafon ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Two Dimensional ◽  
Acoustic Wave Propagation

Investigations on the influence CuO doping on elastic properties of Li2SO4–MgO–P2O5 glass system by means of acoustic wave propagation

2021 ◽  
Vol 330 ◽  
pp. 114270
Author(s):  
A. Venkata Sekhar ◽  
A.V. Kityk ◽  
J. Jedryka ◽  
P. Rakus ◽  
A. Wojciechowski ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Elastic Properties ◽  
Glass System ◽  
Acoustic Wave Propagation

Influence of NiO doping on elastic properties of Li2SO4-MgO-P2O5 glass system-Investigation by means of acoustic wave propagation

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
A. Venkata Sekhar ◽  
A. Siva Sesha Reddy ◽  
A.V. Kityk ◽  
J. Jedryka ◽  
P. Rakus ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Elastic Properties ◽  
Glass System ◽  
Acoustic Wave Propagation

Imaging the Chicxulub Central Crater Zone from Large-Scale Seismic Acoustic Wave Propagation and Gravity Modeling

2021 ◽  
Author(s):  
Carlos Ortiz-Aleman ◽  
Ronald Martin ◽  
Jaime Urrutia-Fucugauchi ◽  
Mauricio Orozco del Castillo ◽  
Mauricio Nava-Flores
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Large Scale ◽  
Gravity Modeling ◽  
Acoustic Wave Propagation ◽  
Central Crater
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