Dynamical generation of macroscale magnetic fields and fast flows in a four-component astrophysical plasma Usman Shazad, M Iqbal Physica Scripta, 2024 We explore the possibility of the generation or amplification of macroscale magnetic fields and flows in a four-component astrophysical dusty plasma composed of mobile massless electrons and positrons, inertial positive ions and negatively charged static dust particles. The investigation demonstrates that when microscopic turbulent ambient plasma energy is predominantly kinetic, a straight dynamo (DY) mechanism is feasible. Conversely, a unified reverse-dynamo/dynamo (RDY/DY) mechanism is possible when the microscopic turbulent ambient plasma energy is primarily magnetic. Additionally, the evolution of Alfvén Mach numbers at the macro- and microscale are significantly affected by plasma species densities and invariant helicities. The potential implications of the present study for astrophysical settings are also highlighted.
Self-organization of earth's inner magnetospheric multi-ion plasma Usman Shazad, M. Iqbal Contributions to Plasma Physics, 2024 The self‐organization of a magnetized multi‐ion plasma, composed of inertialess electrons and inertial H+, He+, and O+ ions, leads to the formation of quadruple Beltrami (QB) field structures. The QB self‐organized state is a linear combination of four single Beltrami fields, and it is a non‐force‐free state that shows strong magnetofluid coupling. Moreover, the QB state is characterized by four relaxed state structures of different length scales. The investigation reveals that the generalized helicities of plasma species and the densities of ion species have a significant impact on the characteristics of the self‐organized vortices in the QB state. The study also highlights the potential consequences of QB field structures on earth's inner magnetosphere, including diamagnetic and paramagnetic trends as well as heating effects resulting from disparate length scales.
Quadruple Beltrami field structures in electron-positron multi-ion plasma Farhat Saleem, Muhammad Iqbal, Usman Shazad Zeitschrift Fur Naturforschung Section A Journal of Physical Sciences, 2024 A quadruple Beltrami (QB) equilibrium state for a four-component plasma that consists of inertial electrons, positrons, lighter positive (H +) ions and heavier negative ions O 2 − $\\left({\\mathrm{O}}_{2}^{-}\\right)$ is derived and investigated. The QB relaxed state is a linear superposition of four distinct single Beltrami fields and provides the possibility of the formation of four self-organized vortices of different length scales. In addition, robust magnetofluid coupling characterizes this non-force-free state. The analysis of the QB state also shows that by adjusting the generalized helicities and densities of plasma species, the formation of multiscale structures as well as the paramagnetic and diamagnetic behavior of the relaxed state can be controlled.
Impact of temperature asymmetry and small fraction of static positive ions on the relaxed states of a relativistic hot pair plasma Usman Shazad, M. Iqbal Zeitschrift Fur Naturforschung Section A Journal of Physical Sciences, 2023 The relaxed state of a magnetized relativistic hot plasma composed of inertial electrons and positrons having different relativistic temperatures and a fraction of static positive ions is studied. From the steady-state solutions of vortex dynamics equations and the relation for current density, a non-force-free triple Beltrami (TB) relaxed state equation is derived. The TB state is characterized by three scale parameters that consequently provide three different self-organized structures. The analysis of the relaxed state shows that for specific values of generalized helicities, the disparity in relativistic temperature and the existence of a small fraction of static positive ions in pair plasma can transform the nature of scale parameters. Moreover, an analytical solution of the TB state for an axisymmetric cylindrical geometry with an internal conductor configuration demonstrates that due to asymmetries of temperature and density of plasma species, diamagnetic structures can transform into paramagnetic ones and vice versa. The present study will improve our understanding of pair plasmas in trap-based plasma confinement experiments and astrophysical environments.
Relaxation of relativistic pair plasma in a massive photon field Usman Shazad, M. Iqbal Journal of Plasma Physics, 2023 The relaxation of relativistic hot electron–positron plasma is investigated by incorporating the effect of non-zero photon mass, and a quadruple Beltrami (QB) relaxed state for the magnetic vector potential is derived. The QB state is a linear superposition of four single force-free fields and is characterized by four self-organized structures of different length scales. The analysis of QB states shows that for certain values of generalized helicities at lower relativistic temperatures, plasma shows diamagnetic behaviour. It is also noteworthy that the inclusion of non-zero photon mass naturally provides the possibility of multiscale structure formation in the relaxed state. In this scenario, one of the field structures is significantly larger than the Compton wavelength of photons, while the other three structures are on the scale of the electron skin depth. The potential implications of this QB state for astrophysical environments are also discussed.
Investigation of the quadruple Beltrami relaxed state in a partially ionized dusty mesospheric plasma: U. Shazad et al. U Shazad, A Shuaib, F Ahmed, M Iqbal Journal of the Korean Physical Society 88 (5), 552-564 , 2026 2026
Impact of Relativistic Temperature on the Catastrophic Loss of Equilibrium in Astrophysical Relativistic Hot Plasma N Ahmad, U Shazad, A Shuaib, GR Yao, X Li, YF Ji Brazilian Journal of Physics 55 (6), 283 , 2025 2025
Double Beltrami Self-Organized Structures in Ionospheric Partially Ionized Dusty Plasma F Ahmed, A Shuaib, U Shazad, M Iqbal Brazilian Journal of Physics 55 (2), 52 , 2025 2025 Citations: 1
Dynamical generation of macroscale magnetic fields and fast flows in a four-component astrophysical plasma U Shazad, M Iqbal Physica Scripta 99 (10), 105613 , 2024 2024 Citations: 2
The effectiveness of common household spices and herbs in combating the COVID-19: A review based on experimental and virtual screening A Saddiqa, U Shazad, S Arshad Journal of Herbal Medicine 46, 100887 , 2024 2024 Citations: 2
On the quadruple Beltrami fields in thermally relativistic electron-positron-ion plasma U Shazad, M Iqbal arXiv preprint arXiv:2407.09369 , 2024 2024 Citations: 7
Relaxation of a two electron-temperature relativistic hot electron-positron-ion plasma U Shazad, M Iqbal Brazilian Journal of Physics 54 (1), 22 , 2024 2024 Citations: 2
Quadruple Beltrami field structures in electron–positron multi-ion plasma F Saleem, M Iqbal, U Shazad Zeitschrift für Naturforschung A 79 (4), 407-415 , 2024 2024 Citations: 2
Self-organization of earth's inner magnetospheric multi-ion plasma U Shazad, M Iqbal Contributions to Plasma Physics 64, e202300175 , 2024 2024 Citations: 3
Relaxation of relativistic pair plasma in a massive photon field U Shazad, M Iqbal Journal of Plasma Physics 89 (5), 905890512 , 2023 2023 Citations: 5
Impact of temperature asymmetry and small fraction of static positive ions on the relaxed states of a relativistic hot pair plasma U Shazad, M Iqbal Zeitschrift für Naturforschung A 78 (11), 983-994 , 2023 2023 Citations: 3
Beltrami fields in partially ionized magnetized dusty plasma F Ahmed, M Iqbal, U Shazad AIP Advances 13 (5), 055305 , 2023 2023 Citations: 4
Multiscale structures in three species magnetoplasmas with two positive ions S Ullah, U Shazad, M Iqbal Physica Scripta 97 (6), 065605 , 2022 2022 Citations: 5
Self-organized multiscale structures in thermally relativistic electron-positron-ion plasmas U Shazad, M Iqbal, S Ullah Physica Scripta 96 (12), 125627 , 2021 2021 Citations: 7
MOST CITED SCHOLAR PUBLICATIONS
On the quadruple Beltrami fields in thermally relativistic electron-positron-ion plasma U Shazad, M Iqbal arXiv preprint arXiv:2407.09369 , 2024 2024 Citations: 7
Self-organized multiscale structures in thermally relativistic electron-positron-ion plasmas U Shazad, M Iqbal, S Ullah Physica Scripta 96 (12), 125627 , 2021 2021 Citations: 7
Relaxation of relativistic pair plasma in a massive photon field U Shazad, M Iqbal Journal of Plasma Physics 89 (5), 905890512 , 2023 2023 Citations: 5
Multiscale structures in three species magnetoplasmas with two positive ions S Ullah, U Shazad, M Iqbal Physica Scripta 97 (6), 065605 , 2022 2022 Citations: 5
Beltrami fields in partially ionized magnetized dusty plasma F Ahmed, M Iqbal, U Shazad AIP Advances 13 (5), 055305 , 2023 2023 Citations: 4
Self-organization of earth's inner magnetospheric multi-ion plasma U Shazad, M Iqbal Contributions to Plasma Physics 64, e202300175 , 2024 2024 Citations: 3
Impact of temperature asymmetry and small fraction of static positive ions on the relaxed states of a relativistic hot pair plasma U Shazad, M Iqbal Zeitschrift für Naturforschung A 78 (11), 983-994 , 2023 2023 Citations: 3
Dynamical generation of macroscale magnetic fields and fast flows in a four-component astrophysical plasma U Shazad, M Iqbal Physica Scripta 99 (10), 105613 , 2024 2024 Citations: 2
The effectiveness of common household spices and herbs in combating the COVID-19: A review based on experimental and virtual screening A Saddiqa, U Shazad, S Arshad Journal of Herbal Medicine 46, 100887 , 2024 2024 Citations: 2
Relaxation of a two electron-temperature relativistic hot electron-positron-ion plasma U Shazad, M Iqbal Brazilian Journal of Physics 54 (1), 22 , 2024 2024 Citations: 2
Quadruple Beltrami field structures in electron–positron multi-ion plasma F Saleem, M Iqbal, U Shazad Zeitschrift für Naturforschung A 79 (4), 407-415 , 2024 2024 Citations: 2
Double Beltrami Self-Organized Structures in Ionospheric Partially Ionized Dusty Plasma F Ahmed, A Shuaib, U Shazad, M Iqbal Brazilian Journal of Physics 55 (2), 52 , 2025 2025 Citations: 1
Investigation of the quadruple Beltrami relaxed state in a partially ionized dusty mesospheric plasma: U. Shazad et al. U Shazad, A Shuaib, F Ahmed, M Iqbal Journal of the Korean Physical Society 88 (5), 552-564 , 2026 2026
Impact of Relativistic Temperature on the Catastrophic Loss of Equilibrium in Astrophysical Relativistic Hot Plasma N Ahmad, U Shazad, A Shuaib, GR Yao, X Li, YF Ji Brazilian Journal of Physics 55 (6), 283 , 2025 2025
