Electrostatic Solitary Pulses in a Dusty Electronegative Magnetoplasma

The nonlinear characteristics of dust-electron-acoustic (DEA) waves in a dusty electronegative magnetoplasma system consisting of nonextensive hot electrons, inertial cold electrons, positively charged static ions, and negatively charged immobile dust grains has been investigated. In this observation, the well-known reductive perturbation technique is employed to determine different types of nonlinear dynamical equations, namely, magnetized Korteweg–de Vries (KdV), magnetized modified KdV (mKdV), and magnetized Gardner equations. The stationary solitary wave and double layer solution of these three equations, which describe the characteristics of solitary waves and double layers of DEA waves, are obtained and numerically analyzed. It is noticed that various plasma parameters (viz., hot electron nonextensivity, positive ion-to-cold electron number density ratio, dust-to-cold electron number density ratio, etc.) significantly affect the basic properties of DEA solitary waves (DEASWs) and Gardner solitons (GSs). The prodigious results found from this theoretical investigation may be useful for researchers to investigate the nonlinear structures in various space and laboratory plasmas.     

Skin Effects in a Dusty Plasma

A multifluid MHD model is applied to study the magnetic field dynamics in a dusty plasma. The motion of plasma electrons and ions is treated against the background of arbitrarily charged, immobile dust grains. When the dust density gradient is nonzero and when the inertia of the ions and electrons and the dissipation from their collisions with dust grains are neglected, we are dealing with a nonlinear convective penetration of the magnetic field into the plasma. When the dust density is uniform, the magnetic field dynamics is described by the nonlinear diffusion equations. The limiting cases of diffusion equations are analyzed for different parameter values of the problem (i.e., different rates of the collisions of ions and electrons with the dust grains and different ratios between the concentrations of the plasma components), and some of their solutions (including self-similar ones) are found. The results obtained can also be useful for research in solid-state physics, in which case the electrons and holes in a semiconductor may be analogues of plasma electrons and ions and the role of dust grains may be played by the crystal lattice and impurity atoms.     

Quasiperiodic Route to Chaos for the Dust Ion Acoustic Waves in Magnetized Dusty Plasmas

Plasma Physics Reports - Quasiperiodic and chaotic features of the dust ion acoustic (DIA) waves in a magnetized dusty plasma is studied. Reductive perturbation technique (RPT) is used to derive...     

Dusty Plasma near the Martian Satellite Deimos

The formation of dusty plasma in the near-surface layer above the illuminated part of the Deimos, the satellite of Mars, due to photoelectric and electrostatic processes is analyzed. Using a physicomathematical model self-consistently describing the densities of photoelectrons and dust grains above the illuminated part of Deimos, the distribution function of photoelectrons near its surface is calculated and the altitude dependences of the electric field, as well as of the number density, charge, and size of dust grains, are determined. It is noted that, due to the lower gravity, substantially larger grains are lifted above the surface of Deimos compared to those lifted above the Moon’s surface. In this case, adhesion, which is believed to significantly hamper the detachment of dust grains from the lunar surface, plays a substantially smaller role on Deimos.     

Wave Processes in the Dusty Plasma at Phobos and Deimos

Plasma Physics Reports - Linear and nonlinear waves in the near-surface plasma at Phobos and Deimos are considered. It is shown that the motion of the solar wind relative to photoelectrons and...     

Electroacoustic Waves in a Collision-Free Magnetized Superthermal Bi-Ion Plasma

Plasma Physics Reports - The electroacoustic waves, particularly ion-acoustic waves (IAWs), and their expansion in the medium of a magnetized collision-free plasma system has been investigated...     

Oscillations of a Magnetized Plasma in a Waveguide of Complicated Shape

Potential hybrid oscillations in a resonator of arbitrary shape are investigated theoretically. It is shown that, for a periodic waveguide, the frequency dependence of the wavenumber is represented by a fractal curve of the “devil’s staircase” type.     

Numerical Simulation of Whistler Waves in Magnetized Plasma with Small-Scale Irregularities

Propagation of whistler-mode waves in magnetized plasma in the presence of small-scale field-aligned irregularities with enhanced or depressed plasma density is simulated numerically. The numerical experiments have demonstrated the effect of guided propagation of whistler-mode waves in plasma regions occupied by irregularities with transverse dimensions smaller than the whistler wavelength in uniform plasma. It is shown that not only individual irregularities but also the entire modified region, which serves as a specific guiding structure, exhibit waveguide properties.     

Cosmic Dusty Plasma and the Global Electric Circuit of the Earth

Plasma Physics Reports - The model of the global electric circuit of the Earth (GECE) is considered, which is inseparably linked with the processes in space plasma. The Earth is surrounded by...     

Dusty Plasma at the Moon. Challenges of Modeling and Measurements

Plasma Physics Reports - A brief review is given of the dusty plasma near the surface of the Moon. Electrostatic processes represent an important factor of formation of such plasma. Problems...     

Calculation of the Second-Order Polarizability of a Warm Magnetized Plasma

An analysis is made of the general expression for the density of a nonlinear charge induced in a magnetized plasma in the interaction between two arbitrary waves. Asymptotic expressions for the nonlinear induced charge density are derived for the first time in the case where both of the interacting waves are short-scale.     

On the Role of Magnetic Fields in the Plasma of Dusty Lunar Exosphere

Plasma Physics Reports - The possible effect is studied of the magnetic field of Earth’s magnetotail and the magnetic field in the regions of magnetic anomalies of the Moon on the processes...     

Role of Collisions with Neutrals in the Process of Modulational Excitation of Dust Acoustic Perturbations in Dusty Ionosphere

Plasma Physics Reports - The role of inelastic collisions of electrons and ions with neutrals during the development of modulational instability involving dust acoustic perturbations in dusty...     

Nonlinear Right-Hand Polarized Wave in Plasma in the Electron Cyclotron Resonance Region

The propagation of a nonlinear right-hand polarized wave along an external magnetic field in subcritical plasma in the electron cyclotron resonance region is studied using numerical simulations. It is shown that a small-amplitude plasma wave excited in low-density plasma is unstable against modulation instability with a modulation period equal to the wavelength of the excited wave. The modulation amplitude in this case increases with decreasing detuning from the resonance frequency. The simulations have shown that, for large-amplitude waves of the laser frequency range propagating in plasma in a superstrong magnetic field, the maximum amplitude of the excited longitudinal electric field increases with the increasing external magnetic field and can reach 30% of the initial amplitude of the electric field in the laser wave. In this case, the energy of plasma electrons begins to substantially increase already at magnetic fields significantly lower than the resonance value. The laser energy transferred to plasma electrons in a strong external magnetic field is found to increase severalfold compared to that in isotropic plasma. It is shown that this mechanism of laser radiation absorption depends only slightly on the electron temperature.     

A Study on Uniformity Characteristics of a Magnetized Inductively Coupled Plasma

Plasma Physics Reports - Non-uniformities in the plasma parameters in a magnetized inductively coupled plasma (M-ICP) etcher were investigated. Further in text of this article the silicon dioxide...     

Broadband Wide-Angle Second Harmonic Generation in Magnetized Plasma: Double Resonant Effect

Conditions for the phase synchronism between high-frequency electromagnetic waves with frequencies ω and 2ω propagating in magnetized plasma are investigated. The variety of the values of the plasma density and magnetic field, as well as of wave polarizations, obeying the synchronism conditions are shown to provide resonant broadband wide-angle nonlinear generation of the second harmonic of the pumping wave. Special attention is given to oblique propagation of interacting waves. The coupling strengths for the resonant mode conversion in magnetized collisional plasma are obtained. The double resonance ensuring efficient nonlinear generation of extraordinary mode in the vicinity of the electron cyclotron resonance (ω(2k) = ω _ce ) is considered. Examples illustrating these nonlinear phenomena for some plasma and radiation parameters are presented.     

Four Tensors Determining Thermal and Electric Conductivities of Degenerate Electrons in Magnetized Plasma

Plasma Physics Reports - A solution to the Boltzmann equation is obtained for a magnetized plasma with strongly degenerate nonrelativistic electrons and nondegenerate nuclei. The components of the...     

On the Scattering of Finite-Aperture Microwave Beams on Density Fluctuations in Inhomogeneous Magnetized Plasma

Plasma Physics Reports - Electrodynamic reciprocity theorem is used for developing the theory of scattering of finite-aperture microwave beams on density fluctuations in inhomogeneous magnetized...     

Four Tensors Determining the Thermal and Electric Conductivities of Non-Degenerate Electrons in Magnetized Plasma

Plasma Physics Reports - A solution to the Boltzmann equation is obtained for a magnetized plasma with non-degenerate electrons and ions by Chapman–Enskog method. To obtain an approximate...     

Radiative and Gravitational Modes and Instabilities in an Inhomogeneous Magneto Dusty Plasma with Charge Variation

Plasma Physics Reports - The Jeans instability of collisional magnetized dusty plasmas is examined incorporating polarization force, charge variation of dust grains, and radiative cooling of ion...