Spatial Statistics of Deep-Water Ambient Noise; Dispersion Relations for Sound Waves and Shear Waves

2014 ◽  
Author(s):  
Michael J. Buckingham
Keyword(s):  
Spatial Statistics ◽  
Deep Water ◽  
Ambient Noise ◽  
Shear Waves ◽  
Dispersion Relations ◽  
Sound Waves

Spectrum Analysis of Deep Water Ambient Noise in the West Pacific

2021 ◽  
Author(s):  
Jiahua Zhu ◽  
Wei Guo ◽  
Bingbing Zhang ◽  
Yanxin Ma ◽  
Yangyang Chen ◽  
...  
Keyword(s):  
Deep Water ◽  
Spectrum Analysis ◽  
Ambient Noise ◽  
The West ◽  
West Pacific

Dispersion relations for electroelastic shear waves in a periodically layered medium

1990 ◽  
Vol 26 (11) ◽  
pp. 1092-1099 ◽  
Author(s):  
L. P. Zinchuk ◽  
A. N. Podlipenets ◽  
N. A. Shul'ga
Keyword(s):  
Layered Medium ◽  
Shear Waves ◽  
Dispersion Relations

Passive acoustic thermometry of the deep water sound channel using ambient noise

2013 ◽  
Vol 134 (5) ◽  
pp. 3983-3983
Author(s):  
Katherine F. Woolfe ◽  
Shane Lani ◽  
Karim G. Sabra
Keyword(s):  
Deep Water ◽  
Ambient Noise ◽  
Sound Channel ◽  
Acoustic Thermometry ◽  
Passive Acoustic

Dispersion relation for electrostatic waves in plasmas with isotropic and anisotropic Kappa distributions for electrons and ions

2017 ◽  
Vol 83 (5) ◽  
Author(s):  
L. F. Ziebell ◽  
R. Gaelzer ◽  
F. J. R. Simões
Keyword(s):  
Dispersion Relation ◽  
Dispersion Relations ◽  
Distribution Functions ◽  
Sound Waves ◽  
Kappa Index ◽  
Langmuir Waves ◽  
Electrostatic Waves ◽  
Particle In Cell ◽  
Significant Difference ◽  
Velocity Distribution Functions

Velocity distribution functions which feature extended tails with power-law dependence have been consistently observed in the solar wind environment and are frequently modelled by the so-called Kappa distributions. Different forms of Kappa distributions are commonly employed in analytical studies, and despite their similarities, they can produce different effects on the dispersion properties that occur in a plasma. We consider two different and widely used forms of Kappa distributions, in both isotropic and anisotropic cases, and systematically discuss their effects on the dispersion relations of Langmuir and ion-sound waves. It is shown that in the case of Langmuir waves, one of the forms leads to the expression for the Bohm–Gross dispersion relation, valid for plasmas with Maxwellian velocity distributions, while the other form of Kappa functions leads to a dispersion relation with significant difference regarding the Maxwellian case, particularly in the case of small values of the kappa index. For ion-sound waves, the dispersion relations obtained with the different forms of Kappa distributions are different among themselves, and also different from the Maxwellian case, with difference which increases for small values of the kappa index. Some results obtained from numerical solution of the dispersion relations are presented, which illustrate the magnitude of the perceived differences. Some results obtained with relativistic particle-in-cell simulations are also presented, which allow the comparison between the dispersion relations obtained from analytical calculations and the frequency–wavelength distribution of wave fluctuations which are observed in numerical experiments.

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