Some aspects of modulational interaction in Earth's dusty ionosphere

2021 ◽  
Vol 28 (3) ◽  
pp. 033703
Author(s):  
T. I. Morozova ◽  
S. I. Kopnin ◽  
S. I. Popel ◽  
N. D. Borisov
Keyword(s):  
Modulational Interaction

scholarly journals Acousto-optic modulation in ion implanted semiconductor plasmas having SDDC

2018 ◽  
Vol 3 (1) ◽  
pp. 303-310 ◽  
Author(s):  
P.S. Malviya ◽  
N. Yadav ◽  
S. Ghosh
Keyword(s):  
Analytical Investigation ◽  
Intense Laser ◽  
Third Order ◽  
Charge Imbalance ◽  
Coupled Mode ◽  
Effective Role ◽  
Semiconductor Plasmas ◽  
Strain Dependent ◽  
Modulational Interaction ◽  
Ion Implanted

AbstractThe present paper is aimed to the exploration of acousto-optic (AO) modulational amplification in ion implanted semiconductors. The AO modulational process has been treated as a four wave parametric mixing process and the effective third-order acousto-optic susceptibility characterizing the instability process has been deduced. By considering that the origin of modulational interaction lies in the third order AO susceptibility arising from the nonlinear induced current density and using the coupled mode theory, an analytical investigation of an intense laser beam in a strain dependent dielectric constant (SDDC) semiconductor crystal is presented. We found a significant change in threshold and gain characteristics with changes in charge imbalance parameter. The presence of colloidal grains (CGs) plays an effective role in changing the threshold intensity and effective gain constant.

Generation of magnetic macrostructures by electromagnetic drift turbulence

2009 ◽  
Vol 75 (3) ◽  
pp. 407-412
Author(s):  
V. D. SHAPIRO
Keyword(s):  
Magnetic Fields ◽  
Drift Waves ◽  
System Of Equations ◽  
Modulational Interaction

AbstractA system of equations for modulational interaction of the electromagnetic branch of drift waves with magnetic cells is constructed. The solution of these equations describes formation of a set of magnetic cells with oppositely directed magnetic fields at their boundaries.

scholarly journals Formation of lower-hybrid solitary structures by modulational interaction between lower-hybrid and dispersive Alfvén waves

2009 ◽  
Vol 27 (3) ◽  
pp. 1027-1033 ◽  
Author(s):  
J. O. Hall ◽  
G. Stenberg ◽  
A. I. Eriksson ◽  
M. André
Keyword(s):  
Numerical Solutions ◽  
Modulational Instability ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Lower Hybrid ◽  
Plasma Parameters ◽  
Thermal Electron ◽  
Cavity Collapse ◽  
Solitary Structures ◽  
Modulational Interaction

Abstract. We investigate the possibility that lower-hybrid solitary structures (LHSS), which are frequently observed in the Earth's ionosphere and magnetosphere, are formed as a result of a modulational interaction between lower-hybrid and dispersive Alfvén waves of initially small amplitude. A large amplitude lower-hybrid pump wave can excite density structures with length scales transverse to the geomagnetic field of the order of the ion gyroradius via a modulational instability. The structure formation in the nonlinear stage of the instability is investigated by numerical solutions of the governing equations, using plasma parameters relevant for LHSS observations in the upper ionosphere and in the magnetosphere. The numerical solutions reveal that the lower-hybrid waves become self-localized inside cylindrically symmetric (with respect to the ambient magnetic field) density cavities, in qualitative agreement with observations. Our model includes thermal electron effects but shows no stabilization at the ion sound gyroradius, suggesting that any preference of observed LHSS for that perpendicular scale likely is due to processes arresting the cavity collapse.

On Modulational Interaction of the Lower-Hybrid Drift Oscillations

1994 ◽  
Vol 34 (1) ◽  
pp. 5-18 ◽  
Author(s):  
S. I. Popel ◽  
I. E. Rumanov ◽  
V. N. Tsytovich
Keyword(s):  
Lower Hybrid ◽  
Modulational Interaction

Theory of modulational interaction of two coupled waves. Part 1. General formulae for a nonlinear medium

1993 ◽  
Vol 49 (2) ◽  
pp. 197-205 ◽  
Author(s):  
Sergey V. Vladimirov ◽  
Vadim N. Tsytovich
Keyword(s):  
Dielectric Function ◽  
Nonlinear Medium ◽  
Modulational Instability ◽  
Single Mode ◽  
Third Order ◽  
Modulational Interaction

The modulational interaction of two waves propagating in a cubically nonlinear medium is considered. It is shown that the correct theory operates with ‘renormalized’ equations for the linear dielectric function and for an effective third-order medium response. This renormalization is due to so-called interference terms. The appearance of interference terms is a specific feature of the two-mode modulational instability in comparison with the well-known instability of a single mode.

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