Article
Geosciences, Multidisciplinary
Z. Y. Liu, B. Wang, Q. G. Zong, S. T. Yao, C. J. Pollock, G. Le
Summary: Understanding electron behavior in whistler waves is crucial for comprehending their role in energizing electrons in space. Observations indicate that whistler waves can effectively trap thermal electrons, causing them to bunch and rotate in perpendicular and parallel directions, respectively.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Physics, Multidisciplinary
Safeer Sadiq
Summary: This paper presents the application of radiation magnetohydrodynamic (RMHD) theory in the nonequilibrium diffusion grey radiation limit. The dispersion relation of small amplitude (linear) waves in RMHD plasma is obtained by perturbing the basic set of equations. It is found that magnetoacoustic waves exhibit dispersion and damping in RMHD plasma. It is also concluded that for very long wavelength magnetosonic mode, the restoring force is provided by radiation pressure and inertia is provided by matter. The effects of radiation energy, diffusivity, and plasma beta on the dispersion and damping of magnetoacoustic mode in RMHD plasma are shown in the form of graphs. The model is applicable to the stellar atmosphere.
Article
Astronomy & Astrophysics
Daye Lim, Valery M. Nakariakov, Yong-Jae Moon
Summary: This study investigates slow magnetoacoustic oscillations in stellar coronal loops with gravitational stratification, focusing on resonant periods and the effects of various factors. Results show that the discrepancy between stratified and nonstratified loops is higher in density perturbations. The periods in stratified loops are slightly longer than in nonstratified loops, with calculated periods consistent with observed stellar quasi-periodic pulsations.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
L. B. De Toni, R. Gaelzer, L. F. Ziebell
Summary: In this work, the characteristics of the group velocity of obliquely propagating Alfven waves in a dusty plasma are investigated. The dispersion relation is derived using kinetic theory and the group velocities are numerically calculated for compressional and shear Alfven waves. The results show that the group velocity of compressional Alfven waves is greatly influenced by the wave-vector direction, while shear Alfven waves propagate mainly along the magnetic field. Changes in dust parameters can significantly alter the waves' characteristics.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Fluids & Plasmas
H. Bouziane, K. Annou
Summary: The study focused on non-linear ion-acoustic solitary structures in a two-component magnetized plasma by using a new distribution of electrons. By changing the plasma parameters, it was found that the behavior and characteristics of solitons can be affected.
CONTRIBUTIONS TO PLASMA PHYSICS
(2021)
Article
Astronomy & Astrophysics
R. Niedziela, K. Murawski, L. Kadowaki, T. Zaqarashvili, S. Poedts
Summary: This paper investigates the heating of the solar chromosphere using a two-fluid model and shows that large-amplitude impulsively generated magnetoacoustic-gravity waves can efficiently heat the chromosphere and generate plasma outflows in the low solar corona.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Jiahui Luo, Zheng Ma, Yun Gong, Shaodong Zhang, Qiao Xiao, Chunming Huang, Kaiming Huang
Summary: Based on the Modern-Era Retrospective Analysis for Research and Applications, version 2 reanalysis data, we study the enhancement of an eastward propagating 4-day wave (E4DW) during the 2019 Antarctic sudden stratospheric warming (SSW). The amplitude of E4DW is centered at 50 degrees S and 50 km with a maximum amplitude of about 20 m/s. The enhanced E4DW significantly exceeds the climatological level and represents the strongest amplitude in the Southern Hemisphere since 1980. Our analysis suggests that the special structure of zonal mean zonal winds caused by the 2019 Antarctic SSW at the stratopause is responsible for the excitation of the record-strong E4DW in the Southern Hemisphere in 2019.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
Yuhu Miao, Dong Li, Ding Yuan, Chaowei Jiang, Abouazza Elmhamdi, Mingyu Zhao, Sergey Anfinogentov
Summary: This study investigated two Quasi-periodic fast propagating (QFP) waves excited by a solar flare, finding that these waves may be periodically excited by the flaring core and exhibit features consistent with the magnetic tuning fork model. The magnetic field inferred with magnetohydrodynamic seismology was consistent with that obtained in the magnetic extrapolation model, indicating that QFP waves are an effective tool for diagnosing both the flaring core and the magnetic waveguide.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Physics, Applied
Rhodri Mansell, Taddaus Schaffers, Rasmus B. Hollander, Huajun Qin, Sebastiaan van Dijken
Summary: This paper uses micromagnetic simulations to study the interaction between spin waves and skyrmions. By altering the size of the skyrmion, the emitted spin wave profile can be controlled.
APPLIED PHYSICS LETTERS
(2022)
Article
Astronomy & Astrophysics
Xinping Zhou, Yuandeng Shen, Hongfei Liang, Zhining Qu, Yadan Duan, Zehao Tang, Chengrui Zhou, Song Tan
Summary: The study of QFP wave trains reveals they are triggered by energy release from flares rather than waveguide dispersion. Measurements of phase and group speed confirm that the waves are not dispersed. Additionally, estimates of energy flux and magnetic field strength were obtained through seismological applications.
ASTROPHYSICAL JOURNAL
(2022)
Article
Multidisciplinary Sciences
Luiz Gallisa Guimaraes
Summary: This research focuses on the propagation of weakly non-linear ocean waves in intermediate waters, identifying features such as hole solitons and high-intensity multi-peak progressive waves, which satisfy a wave equation model similar to the Korteweg de Vries equation and are strongly dependent on initial conditions.
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
(2022)
Article
Engineering, Aerospace
Uday Narayan Ghosh
Summary: This article studies the electron acoustic potential structures generated in Earth's magnetotail region and magnetosphere in the presence of a large-amplitude electric field. Nonlinear evolution equations are derived and exact analytic solutions are obtained using the Hirota Bilinear method. The study focuses on the interactions of multiple singular solitons in the obtained solutions.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Engineering, Aerospace
Sergey Kshevetskii, Yuliya Kurdyaeva, Nikolay Gavrilov
Summary: This study proposes and analyzes the idea of replacing a tropospheric heat source with a surface source of pressure oscillations to generate waves. The discrepancies caused by this replacement are estimated using experiments with a high-resolution numerical model. The results show that the wave amplitudes in the upper atmosphere are very close for both tropospheric heat and surface pressure sources, except for frequencies of internal gravity waves where the amplitudes for the surface pressure generation could be larger.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Oceanography
Christoph S. Funke, Marc P. Buckley, Larissa K. P. Schultze, Fabrice Veron, Mary-Louise E. Timmermans, Jeffrey R. Carpenter
Summary: The quantification of pressure fields in the airflow over water waves is crucial for understanding the coupling of atmosphere and ocean. By utilizing laboratory experiments of wind-driven surface waves, a reconstruction technique based on solving a pressure Poisson equation in the airflow above water waves was developed, allowing for independent quantification of momentum flux components. The study showed a greater influence of form drag on momentum flux at high wind speeds and wave slopes, providing insight into the interaction between different components affecting momentum flux.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Physics, Applied
Trishul Dhalia, Rohit Juneja, Laxman Prasad Goswami, Srimanta Maity, Amita Das
Summary: In this study, particle-in-cell simulations are used to investigate the harmonic generation of electromagnetic waves in a magnetized plasma. Odd higher harmonics of linearly polarized waves are excited, with the maximum harmonic generation occurring when the incident wave frequency matches the electron cyclotron frequency. No harmonics are excited when the incident wave has circular polarization. These studies show that by carefully adjusting plasma parameters, higher frequency EM waves with the desired circular polarization can be generated.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
R. Jahangir, S. Ali, Arshad M. Mirza
PHYSICS OF PLASMAS
(2018)
Article
Physics, Multidisciplinary
Usman Hasan, W. Masood, R. Jahangir, Arshad M. Mirza
Article
Physics, Multidisciplinary
R. Jahangir, S. Ali, Arshad M. Mirza, W. Masood
Article
Physics, Fluids & Plasmas
R. Jahangir, W. Masood
PHYSICS OF PLASMAS
(2020)
Article
Physics, Fluids & Plasmas
Usman Hasan, Waqas Masood, Rabia Jahangir, Arshad Majid Mirza
Summary: This study investigated the interaction of obliquely propagating ion acoustic solitary waves in a magnetoplasma with relativistically degenerate electrons. The researchers derived a set of KdV equations for two solitons and observed phase shifts as a result of their interaction. The phase shifts were found to be dependent on the obliqueness and the physical parameters of the plasma, with enhancements in number density leading to increased phase shifts.
CONTRIBUTIONS TO PLASMA PHYSICS
(2021)
Article
Physics, Multidisciplinary
H. Nawaz, W. Masood, R. Jahangir, M. Siddiq
Summary: The multi-soliton solutions of the Gardner equation were obtained using Hirota's bilinear formalism and studied in the context of plasmas for the first time. The simultaneous presence of quadratic and cubic nonlinearities in the Gardner equation may lead to overtaking and head-on interactions among solitons. The plasma parameters influence the spatial scale of interaction, with comparisons made between kappa distributed plasma and Maxwellian case, exploring key differences in the parametric regimes.
Article
Physics, Multidisciplinary
S. Hassan, R. Jahangir, W. Masood, N. Batool, M. Siddiq, A. M. Mirza
Summary: The study investigates low frequency, electrostatic, pure drift mode in dense magnetized electron-ion plasma with relativistically degenerate electrons using the quantum magnetohydrodynamic model. The research shows that the growth rate of waves increases with the ratio of background ion temperature to density, and graphical illustrations demonstrate the effects of various parameters on nonlinear structures. This work may contribute to understanding low frequency phenomena in dense inhomogeneous plasmas such as neutron stars, white dwarfs, and next generation lasers.
Article
Physics, Multidisciplinary
M. Yousaf Khattak, W. Masood, R. Jahangir, M. Siddiq
Summary: This study investigates nonlinear electrostatic waves on the ion time scale in a quantum magnetoplasma with relativistically degenerate electrons, deriving the Zakharov Kuznetsov (ZK) equation and obtaining single and two soliton solutions using Hirota formalism. The research examines nonrelativistic and ultrarelativistic limits of the relativistically degenerate electrons and their interaction with ZK solitons, with different spatial and temporal scales observed for nonrelativistic and ultrarelativistic cases.
WAVES IN RANDOM AND COMPLEX MEDIA
(2021)
Article
Physics, Multidisciplinary
R. Jahangir, S. Ali
Summary: This study investigates the formation of nonlinear ion-acoustic waves in degenerate magnetoplasmas with quantized and trapped electrons. A three-dimensional Zakharov-Kuznetsov equation is derived and the stability is discussed, with numerical analyses showing the impact of quantized magnetic field parameter and electron degeneracy on the amplitude and width of electric potential. The results suggest that higher values of these parameters tend to stabilize solitons in degenerate plasmas, which could be important for understanding wave propagation and instability growth in dense plasmas in stellar and laboratory settings.
FRONTIERS IN PHYSICS
(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
Multidisciplinary Sciences
Wedad Albalawi, Rabia Jahangir, Waqas Masood, Sadah A. Alkhateeb, Samir A. El-Tantawy
Summary: This study investigates the propagation of electron-acoustic waves in an unmagnetized plasma, discussing both unmodulated and modulated structures such as solitary waves, rogue waves, and breathers. The Sagdeev potential approach and nonlinear Schrodinger equation are employed to study the characteristics of these waves, including their modulated solutions. Plasma parameters, particularly spectral indices r and q, are examined in detail to understand the behavior of electron acoustic waves in different distribution functions.
Article
Physics, Multidisciplinary
H. Nawaz, R. Jahangir, W. Masood, M. Siddiq
Summary: This study investigates the nonlinear propagation of electrostatic waves with cubic nonlinearity in a multicomponent dusty plasma. The amplitude of dust ion acoustic mKdV soliton is thoroughly examined based on data from Saturn's magnetosphere. Furthermore, the interaction between two mKdV solitons and the interaction of compressive and rarefactive dust ion acoustic solitons are explored.
Article
Mathematics, Interdisciplinary Applications
M. Yousaf Khattak, W. Masood, R. Jahangir, M. Siddiq, Haifa A. Alyousef, S. A. El-Tantawy
Summary: This study examines the propagation of nonlinear ion-acoustic waves in a magnetoplasma with superthermal inertialess electrons and inertial warm adiabatic ions. The Zakharov Kuznetsov (ZK) equation is derived to investigate the characteristics of ion-acoustic solitons in the small but finite amplitude limit. Using the Hirota bilinear method, single and two-solitons solutions of the two and three-dimensional ZK equations are obtained. The effects of superthermality, magnetic field, ion number density, and ion temperature on the profiles of single and two-solitons are explored based on the parameters of Van Allen radiation belts, and estimates of the spatial extent of soliton interaction in the outer radiation belts are provided.
CHAOS SOLITONS & FRACTALS
(2022)
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)