Article
Geosciences, Multidisciplinary
I. Y. Vasko, F. S. Mozer, S. D. Bale, A. Artemyev
Summary: This study presents an analysis of electrostatic waves observed near the quasi-perpendicular Earth's bow shock by the Magnetospheric Multiscale spacecraft. The analysis reveals that these electrostatic waves have large amplitudes and can propagate almost perpendicular to the local magnetic field. The results suggest that these waves may strongly affect the dynamics of electrons in collisionless shocks.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Abdulrahman Alharbi, L. Schiesko, T. Minea
Summary: This paper investigates ion-neutral charge-exchange collisions in plasmas, which play a fundamental role in understanding wave dissipation and wave generation phenomena. A charge-exchange collision operator is introduced in the Boltzmann-Poisson system equations for weakly ionized plasmas, revealing important results regarding plasma conductivity and the dielectric function. The study demonstrates backward wave propagation at maximum conductivity when the wavenumber of the plasma wave is smaller than the reciprocal of the ion-neutral collisions mean free path, and enhances ion-acoustic waves and leads to fundamental instability under certain circumstances.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Frank Verheest, Manfred A. Hellberg
Summary: Recent research has shown that under certain conditions, soliton speeds decrease while amplitudes increase, contradicting traditional understanding. By simplifying the model and neglecting thermal effects, it was found that these effects are primarily due to beam properties rather than ion thermal effects.
Article
Mechanics
Muhammad Shohaib, W. Masood, Haifa A. Alyousef, M. Siddiq, S. A. El-Tantawy
Summary: In this study, ion-acoustic waves in an unmagnetized collisionless plasma were investigated, and the characteristics of ion-acoustic structures, including solitary waves and the interaction of ion-acoustic waves, were examined. It was found that the ratio of number density of cold to hot electrons and the non-Maxwellian nature of cold electrons have significant effects on the propagation characteristics of individual solitons and the interaction time of ion-acoustic solitons. Additionally, it was observed that the interaction speed of solitons for flat-topped distribution is faster than that for kappa and Maxwellian distributions.
Article
Physics, Multidisciplinary
Chandan Maity, Mithun Karmakar
Summary: This study investigates the wave characteristics of high frequency Langmuir modes in electron-positron-ion-dusty plasmas. Relativistic dynamics is considered for the electrons, positrons, and ions, while the dust grains form a fixed charge neutralizing background. The wave breaking amplitudes of these high frequency oscillations are derived using the Sagdeev pseudopotential approach, which are shown to depend on various system parameters.
Article
Physics, Fluids & Plasmas
Debaditya Kolay, Debjit Dutta
Summary: The propagation dynamics of nucleus-acoustic waves (NAW) in a quantum plasma composed of nondegenerate inertial light nuclei, stationary heavy nuclei, and ultra-relativistically degenerate electrons and positrons were investigated. The Boussinesq equation, valid for bi-directional propagation of small but finite amplitude limit, was used for the theoretical investigation. The N-soliton solution was derived using Hirota's method. It was found that positive potential structures exist in the sonic and supersonic regimes, while negative potential structures are present in the subsonic regime. The findings were analyzed in terms of different parameters and discussed in the context of ultra-relativistic astrophysical plasmas.
PHYSICS OF PLASMAS
(2023)
Article
Mathematics, Applied
Alvaro G. Lopez, Rustam Ali, Laxmikanta Mandi, Prasanta Chatterjee
Summary: The study presents a hydrodynamic model of a quantum dusty plasma and mathematically proves the conservatism of the resulting dust ion-acoustic plasma waves. The property is further confirmed numerically and chaotic dynamics are explored using Lyapunov characteristic exponents. The research shows the existence of chaotic dynamics for a wide range of parameter values and illustrates how they organize in the parameter space with continuously varying initial conditions.
Article
Mechanics
Andres Calvo-Rivera, Alexander L. Velikovich, Cesar Huete
Summary: We conducted a theoretical and numerical stability analysis for a piston-driven planar shock subjected to two-dimensional perturbations. The obtained results are consistent with the well-known theory for isolated planar shocks. Non-decaying oscillations of shock-front ripples were observed in the range of h(c) < h < 1 + 2M(2), where h represents the D'yakov-Kontorovich (DK) parameter related to the slope of the Rankine-Hugoniot curve, h(c) is the critical value corresponding to the onset of the spontaneous acoustic emission (SAE), and M-2 is the downstream Mach number. The presence of the piston leads to the occurrence of additional frequencies due to the reflection of sonic waves on the piston surface. An unstable behavior of the shock perturbation is possible when there is an external excitation source whose frequency coincides with the self-induced oscillation frequency in the SAE regime, within the range h(c) < h < 1 + 2M(2). Furthermore, unstable evolution of the shock is also observed for planar shocks subjected to one-dimensional perturbations within the range 1 < h < 1 + 2M(2). Both numerical integration of the Euler equations using the method of characteristics and theoretical analysis using Laplace transform were employed to validate the results.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Bachirou Bachir Mouhammadoul, A. Alim, C. G. L. Tiofack, A. Mohamadou, Albandari W. Alrowaily, Sherif. M. E. Ismaeel, S. A. El-Tantawy
Summary: This investigation explores the modulation of weakly positron-acoustic waves (PAWs) in four-component magnetoplasmas with nonextensive electrons and fluid positrons. The researchers derived the nonlinear Schrodinger equation (NLSE) for the PAWs using the derivative expansion technique. Through linear stability analysis, the modulational instability (MI) in the current magnetoplasma model was studied, and it was found that the magnetic field parameter significantly affects the bandwidth and maximum amplitude of the MI. The obtained results have implications for understanding the acceleration mechanism of static electrostatic wave packets in various plasma environments.
Article
Acoustics
Dilip Prasad
Summary: This study employs an asymptotic approach to investigate the effects of dispersion on acoustic disturbances propagating through cylindrical ducts. Linear potential perturbations are found to be weakly dispersive in the high-frequency limit, with additional dispersive effects from an acoustic liner. The inclusion of weak nonlinearity along with dispersion results in more complex waveforms.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Physics, Multidisciplinary
C. Lavanya
Summary: The modulational instability of ion-acoustic waves in a unmagnetized multicomponent plasma was investigated, with emphasis on the effects of positron concentration and temperature ratio of electron to positron. Increasing the strength of these parameters leads to localization of the ion-acoustic waves. The relevance of the theoretical results in understanding localized electrostatic disturbances in space and astrophysical situations where electron-positron-ion plasmas are present was highlighted.
INDIAN JOURNAL OF PHYSICS
(2021)
Article
Optics
Wendong Wu, Shu Chai, Yuegui Zhou
Summary: The monitoring of energy deposition behavior during plasma formation using laser-induced breakdown thermometry techniques is essential. A method based on acoustic waveforms from laser-induced plasmas was proposed to monitor the deposited energy. Linear relationships between acoustic energy and deposited energy were established for different focal lengths. After correcting sound propagation distortions, the applicable range of this method was extended up to 240 mJ of deposited energy. Spectra analysis revealed an increase in the total number density of excited species with deposition energy, but no significant fluctuations in plasma temperature in the high-energy region.
Article
Physics, Fluids & Plasmas
S. Bansal, T. S. Gill
Summary: The study investigates the head on collision of two electron acoustic shock waves in cylindrical/spherical geometries with kappa-distributed hot electrons. The dynamics of shock wave interaction depends significantly on the geometry factor m and the influence of physical parameters such as superthermal distribution of electrons, kinematic viscosity, and density ratio on the phase shifts of the shock structure is examined. It is found that shock interactions differ from soliton interactions, and the dispersion and dissipation of colliding nonlinear structures play a combined role in trajectory variations.
PLASMA PHYSICS REPORTS
(2022)
Article
Physics, Multidisciplinary
Mohan Ghosh, Sourav Pramanik, Samiran Ghosh
Summary: The research explores the propagation dynamics of nonlinear electron acoustic waves (EAW) in collisionless unmagnetized plasmas analytically and numerically. It is found that in the supersonic range, the wave becomes unstable in the short wave limit and reaches a maximum value in the nonlinear stage before damping, showing breather structures apart from the usual solitary wave solutions. The results are discussed in the context of astrophysical plasmas.
Article
Physics, Fluids & Plasmas
R. Jahangir, S. Ali
Summary: The formation and propagation of nonlinear ion-acoustic waves in an unmagnetized cold viscous plasma were studied. The effects of plasma parameters and geometrical factors on the soliton and shock structures were investigated. The shape of the structures was found to be parabolic due to the interplay of transverse and time coordinates.
PLASMA PHYSICS AND CONTROLLED FUSION
(2022)
Article
Physics, Fluids & Plasmas
H. Rizvi, C. M. Ryu, Z. Lin
Article
Physics, Fluids & Plasmas
Q. Haque, Sidra Ali, H. Rizvi, Arshad M. Mirza
PHYSICS OF PLASMAS
(2017)
Article
Physics, Fluids & Plasmas
M. Shahzad, H. Rizvi, A. Panwar, C. M. Ryu
PHYSICS OF PLASMAS
(2017)
Article
Physics, Multidisciplinary
S. Hussain, H. Rizvi
EUROPEAN PHYSICAL JOURNAL PLUS
(2019)
Article
Physics, Fluids & Plasmas
Naira Hamid, W. Masood, H. Rizvi
CONTRIBUTIONS TO PLASMA PHYSICS
(2019)
Article
Physics, Multidisciplinary
Shakir Ullah, W. Masood, M. Siddig, H. Rizvi
Article
Physics, Multidisciplinary
Sidra Ali, W. Masood, H. Rizvi, Arshad M. Mirza
Article
Physics, Fluids & Plasmas
M. Shahzad, H. Rizvi, A. Panwar, C. M. Ryu, T. Rhee
PHYSICS OF PLASMAS
(2020)
Article
Astronomy & Astrophysics
Nadia Imtiaz, Omar Hammou Ali, Haider Rizvi
Summary: This study investigates the impact of an intense geomagnetic storm on the equatorial and low latitude ionosphere over Asia, Africa, and America. The storm-time variation of electron density, thermosphere response, and disturbances in the Earth's magnetic field and ionospheric electric currents are analyzed. The findings suggest that factors such as ionospheric electrodynamics, thermosphere neutral composition, and neutral wind circulations play a crucial role in the observed storm-time response of the ionosphere.
ASTROPHYSICS AND SPACE SCIENCE
(2021)
Article
Physics, Fluids & Plasmas
Muhammad Shohaib, Waqas Masood, Rabia Jahangir, Mohsin Siddiq, Haider Rizvi
Summary: Dust ion acoustic waves (DIAWs) in multi-component plasmas are analyzed using reductive perturbation technique and fluid theory. The effects of electron flatness and superthermality in phase space on the linear and nonlinear propagation of DIAWs are investigated. The interaction of MKP solitons in the presence of dust and non-Maxwellian electron distributions in Saturn's B-ring is discussed.
CONTRIBUTIONS TO PLASMA PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Sidra Ali, W. Masood, H. Rizvi, R. Jahangir, Arshad M. Mirza
Summary: In magnetized two-ion component plasmas with distributed electrons, two modes of ion acoustic waves, fast and slow, are observed to exhibit different propagation characteristics of nonlinear solitary structures. The system is shown to admit compressive and rarefactive solitary structures and periodic wave solutions. Changes in the concentration and temperature ratios of heavy and light ions affect the behavior of the fast and slow modes, respectively, altering the propagation of nonlinear ion acoustic waves.
Article
Astronomy & Astrophysics
Nadia Imtiaz, Richard Marchand, Haider Rizvi
Summary: This study numerically investigates the impact of magnetic field orientation on needle Langmuir probes onboard nano-satellites. The results show that the magnetic field connectivity affects the current characteristics of the probe, providing insights for the interpretation of in situ measurements.
ASTROPHYSICS AND SPACE SCIENCE
(2022)
Article
Astronomy & Astrophysics
R. Jahangir, W. Masood, H. Rizvi
Summary: The propagation and interaction of linear and nonlinear electron acoustic waves in an unmagnetized plasma are studied. The dispersion relation and KdV equation for EAWs are derived and the fundamental properties of electron acoustic solitary waves are investigated. The types of overtaking interaction of two mKdV solitons are also explored.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2022)
Article
Mechanics
M. Shahzad, N. Imtiaz, H. Rizvi, W. Masood, Albandari W. Alrowaily, Sherif. M. E. Ismaeel, S. A. El-Tantawy
Summary: The study focuses on the properties of the dust-acoustic solitary waves in a complex magnetoplasma consisting of negatively charged moving dust grains, inertialess electrons, and ions obeying Maxwell and kappa distributions in the lower ionospheric region. The reductive perturbation technique is used to obtain the Zakharov-Kuznetsov (ZK) equation within the given framework. The obtained ZK equation is transformed into a planar dynamical system to study the qualitative behavior of the solitary waves. Numerical investigations are conducted to examine the influence of important physical parameters on the profile of the nonlinear structures. The findings contribute to the understanding of low-frequency irregularities in the lower ionosphere.
Article
Mathematics, Interdisciplinary Applications
R. Jahangir, W. Masood, H. Rizvi
Summary: This study investigates the face-to-face interaction of two dust acoustic solitons with adiabatically trapped ions and Maxwellian electrons in a dusty plasma. The results show that the interaction and phase shifts of the solitons cannot be obtained analytically for the trapped case and need to be evaluated numerically. It is found that the phase shift depends on the velocities of the solitons, as well as the number density of electrons and the temperature of ions.
CHAOS SOLITONS & FRACTALS
(2023)
