Slowly decaying drift turbulence with wave effects

1999 ◽  
Vol 61 (4) ◽  
pp. 601-622 ◽  
Author(s):  
GIOVANNI MANFREDI
Keyword(s):  
Wave Propagation ◽  
Mode Coupling ◽  
Narrow Band ◽  
Perpendicular Direction ◽  
Nonlinear Interactions ◽  
Linear Waves ◽  
Wave Effects ◽  
Geostrophic Turbulence ◽  
Nonlinear Mode Coupling ◽  
The Waves

The effect of linear waves on the Charney–Hasegawa–Mima model of drift and geostrophic turbulence is studied numerically for a slowly decaying field. It is shown that wave effects can reduce the efficiency of nonlinear mode coupling, effectively ‘freezing’ the spectrum to a narrow band in wavenumber space. Selective nonlinear interactions tend to favour velocities parallel to the direction of propagation of the waves. Accordingly, anisotropic spectra are observed, steeper in the direction of wave propagation, and shallower in the perpendicular direction.

scholarly journals Coronal waves in coronal loops during non-flare stage

2008 ◽  
Vol 4 (S257) ◽  
pp. 245-249
Author(s):  
Dmitry Prosovetsky
Keyword(s):  
Magnetic Field ◽  
Wave Propagation ◽  
Solar Disk ◽  
Solar Limb ◽  
Active Area ◽  
Perpendicular Direction ◽  
Coronal Loops ◽  
New Type ◽  
The Waves ◽  
Outer Area

AbstractUsing SOHO/EIT Fe XII λ195 Å observations the new type of oscillations in coronal loops was detected. The oscillation corresponds to wave propagated to outer area of atmosphere of active area. As opposed to most kind of oscillations associated with coronal loops the waves are observed at non-flare stage of active areas evolution. Velocities of the wave propagation were 8-20 km s−1 and had quasi-perpendicular direction with magnetic field. Such waves were detected in active areas located on solar disk and loops structures outside solar limb. Investigation of EIT data shows the waves are not result of changes of topology of a magnetic field and loops configuration. The nature and probable sources of waves are discussed.

Numerical study of Love wave propagation

Geophysics ◽  
1983 ◽  
Vol 48 (7) ◽  
pp. 833-853 ◽  
Author(s):  
K. R. Kelly
Keyword(s):  
Numerical Modeling ◽  
Wave Propagation ◽  
Love Wave ◽  
Fourier Transforms ◽  
Narrow Band ◽  
Numerical Study ◽  
Two Dimensional ◽  
Band Pass ◽  
The Waves ◽  
Insight Into

Love wave propagation is studied by investigating numerical modeling results for several examples of geologic interest. The modal characteristics of the results are clarified by the use of narrow band‐pass filters and two‐dimensional Fourier transforms in range and time. Such processing makes it possible to study changes in phase and group velocity for the various modes and to locate points of reflection. This permits one to gain insight into changes in the physical properties of the surface channel supporting the waves.

scholarly journals Anomalous Anderson localization behavior in gain-loss balanced non-Hermitian systems

Nanophotonics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 443-452
Author(s):  
Tianshu Jiang ◽  
Anan Fang ◽  
Zhao-Qing Zhang ◽  
Che Ting Chan
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Waves ◽  
Anderson Localization ◽  
Random Media ◽  
Normal Incidence ◽  
Disordered Media ◽  
One Dimensional ◽  
Gain Loss ◽  
The Waves ◽  
Localization Behavior

AbstractIt has been shown recently that the backscattering of wave propagation in one-dimensional disordered media can be entirely suppressed for normal incidence by adding sample-specific gain and loss components to the medium. Here, we study the Anderson localization behaviors of electromagnetic waves in such gain-loss balanced random non-Hermitian systems when the waves are obliquely incident on the random media. We also study the case of normal incidence when the sample-specific gain-loss profile is slightly altered so that the Anderson localization occurs. Our results show that the Anderson localization in the non-Hermitian system behaves differently from random Hermitian systems in which the backscattering is suppressed.

Nonlinear-mode-coupling-induced soliton crystal dynamics in optical microresonators

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Tianye Huang ◽  
Jianxing Pan ◽  
Zhuo Cheng ◽  
Gang Xu ◽  
Zhichao Wu ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Optical Microresonators ◽  
Nonlinear Mode ◽  
Crystal Dynamics ◽  
Nonlinear Mode Coupling

scholarly journals Airglow Measurements of Gravity Wave Propagation and Damping over Kolhapur (16.5°N, 74.2°E)

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
R. N. Ghodpage ◽  
A. Taori ◽  
P. T. Patil ◽  
S. Gurubaran ◽  
A. K. Sharma ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Gravity Wave ◽  
Meridional Wind ◽  
Vertical Wavelength ◽  
Emission Layer ◽  
Positive Correlation ◽  
Intensity Measurements ◽  
Wind Shears ◽  
The Waves ◽  
Airglow Intensity

Simultaneous mesospheric OH and O  (1S) night airglow intensity measurements from Kolhapur (16.8°N, 74.2°E) reveal unambiguous gravity wave signatures with periods varying from 01 hr to 9 hr with upward propagation. The amplitudes growth of these waves is found to vary from 0.4 to 2.2 while propagating from the OH layer (~87 km) to the O (1S) layer (~97 km). We find that vertical wavelength of the observed waves increases with the wave period. The damping factors calculated for the observed waves show large variations and that most of these waves were damped while traveling from the OH emission layer to the O (1S) emission layer. The damping factors for the waves show a positive correlation at vertical wavelengths shorter than 40 km, while a negative correlation at higher vertical wavelengths. We note that the damping factors have stronger positive correlation with meridional wind shears compared to the zonal wind shears.

Coverage Efficiency of Narrow-Band Wave Propagation in Mining Environments

2009 ◽  
Vol 51 (2) ◽  
pp. 391-400 ◽  
Author(s):  
Manani Moutairou ◽  
Gilles Y. Delisle ◽  
Hasna Aniss ◽  
Michel Misson
Keyword(s):  
Wave Propagation ◽  
Narrow Band

Photorefractive waveguides and nonlinear mode coupling effects

1989 ◽  
Vol 54 (8) ◽  
pp. 684-686 ◽  
Author(s):  
Baruch Fischer ◽  
Mordechai Segev
Keyword(s):  
Mode Coupling ◽  
Coupling Effects ◽  
Nonlinear Mode ◽  
Nonlinear Mode Coupling
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