The plasma modes are significantly influenced by the simple or/and molecular anions. The reciproc... more The plasma modes are significantly influenced by the simple or/and molecular anions. The reciprocity of beam and tri-ion electron (TIE) plasmas is modeled by the kinetic theory. The set of Vlasov–Poisson equation is solved and decomposed by the Laguerre–Gaussian function under paraxial approximation. The beam plasma expedites unstable twisted modes (UTMs) in the TIE plasma. The UTM or instability is calibrated via axial and azimuthal wave numbers, wind speed, and its growth essence. The qualitative and quantitative anatomy of the instability threshold is also predicted. Our model is eminently applicable to the space plasmas and has been applied to the Ar+ –F− –SF6− and Xe +–F−–SF6− electron plasmas, specifically.
The Kinetic Theory of non-Maxwellian Lang-muir modes is developed in the presence of Orbital Angu... more The Kinetic Theory of non-Maxwellian Lang-muir modes is developed in the presence of Orbital Angular Momentum. The Laguerre-Gaussian (LG) mode function is applied for the modeling of the non-Maxwellian twisted dielectric function to study the Landau wave-particle interaction in electron plasma system. In the last sention, some numercial results are also presented using appropriate parameters of electron plasma waves.
Twisted waves are usually characterized as the waves carrying orbital angular momentum (OAM). The... more Twisted waves are usually characterized as the waves carrying orbital angular momentum (OAM). The characteristic parameter of orbital angular momentum appears due to presence of helical electric field. The propagation of twisted waves is predominantly defined by the longitudinal and azimuthal wave numbers for the unmagnetized case. The longitudinal wave number reflects the variation in the spatial symmetry while the varying phase of non-planar helical wave fronts is shown by the azimuthal wave number.
The Landau damping rates of ion acoustic wave are studied by using Vlasov-Poisson model for unmag... more The Landau damping rates of ion acoustic wave are studied by using Vlasov-Poisson model for unmagnetized Lorentzian or kappa distributed plasma containing electrons, positively and negatively charged ions. It is found that the damping rate of ion acoustic wave is increased with the decrease of kappa (i.e., the spectral index of Lorentzian distribution) value. The damping rates of the electrostatic wave in multi-ion component plasmas are discussed in detail which depends on electron to ion temperature ratio and ions masses and density ratios. The numerical results are also shown by choosing some typical experimental parameters of multi-ion plasmas. V
In a three species electron-ion-dust plasma following a generalized non-Maxwellian distribution f... more In a three species electron-ion-dust plasma following a generalized non-Maxwellian distribution function (Lorentzian or kappa), it is shown that a kinetic instability of dust-acoustic mode exists. The instability threshold is affected when such (quasineutral) plasma permeates through another static plasma. Such case is of interest when the solar wind is streaming through the cometary plasma in the presence of interstellar dust. In the limits of phase velocity of the waves larger and smaller than the thermal velocity of dust particles, the dispersion properties and growth rate of dust-acoustic mode are investigated analytically with validation via numerical analysis.
Employing Vlasov-Poisson model for nonthermal distributed permeating plasma consisting of electro... more Employing Vlasov-Poisson model for nonthermal distributed permeating plasma consisting of electronpositron-ion plasma of our earth's magnetosphere and the solar wind plasma with some fixed streaming velocity, can drive ion-acoustic waves unstable. The growth rates are computed with respect to the variation in spectral index of the kappa or generalized Lorentzian distribution and streaming velocity of the solar wind. It is found that the growth rate increases with the decrease of spectral index and increases with the streaming velocity of the solar wind. The numerical results are also presented by choosing some suitable parameters.
The plasma modes are significantly influenced by the simple or/and molecular anions. The reciproc... more The plasma modes are significantly influenced by the simple or/and molecular anions. The reciprocity of beam and tri-ion electron (TIE) plasmas is modeled by the kinetic theory. The set of Vlasov–Poisson equation is solved and decomposed by the Laguerre–Gaussian function under paraxial approximation. The beam plasma expedites unstable twisted modes (UTMs) in the TIE plasma. The UTM or instability is calibrated via axial and azimuthal wave numbers, wind speed, and its growth essence. The qualitative and quantitative anatomy of the instability threshold is also predicted. Our model is eminently applicable to the space plasmas and has been applied to the Ar+–F−–[Formula: see text] and Xe+–F−–[Formula: see text] electron plasmas, specifically.
Alle rechten voorbehouden. Niets uit deze uitgave mag worden vermenigvuldigd en/of openbaar gemaa... more Alle rechten voorbehouden. Niets uit deze uitgave mag worden vermenigvuldigd en/of openbaar gemaakt worden door middel van druk, fotokopie, microfilm, elektronisch of op welke andere wijze ook zonder voorafgaande schriftelijke toestemming van de uitgever. All rights reserved. No part of the publication may be reproduced in any form by print, photoprint, microfilm, electronic or any other means without written permission from the publisher. PREFACE Tom Van Doorsselaere, Prof. dr. Rony Keppens for their social counselling during the coffee and lunch breaks, throughout my stay at KU Leuven, Belgium, and Prof. dr. Giovanni Lapenta to allow me to follow the wonderful course on Space Weather. I am also obliged to dr. Yana G. Maneva for her worthy collaborative projects for dusty plasmas and dr. Kirit Mukwana for his kind cooperation. I would like to present special thanks to dr. Shabaan M. Shabaan for his technical support in some research issues. Finally, I want to include the names of some very interactive colleagues like
Waves in bi-ion plasmas are affected by asymmetry. The kinetic theory of the Maxwellian and Loren... more Waves in bi-ion plasmas are affected by asymmetry. The kinetic theory of the Maxwellian and Lorentzian/Kappa-distributed bi-ion plasma is ameliorated to incorporate the transfer of orbital angular momentum from the helical electric field to the plasma modes. By operating the Laguerre-Gaussian (LG) function, the perturbed distribution function and helical electric field are decomposed into characteristic axial and azimuthal components. In symmetric bi-ion plasmas, the conventional ion modes/waves are only present if both ions have similar masses and the concentration of the electrons is negligible. An imbalance of the symmetry is considered by the contamination of a small fraction of the heavy immobile ions, which urges the negative ions to become heavier than the positive ions in the bi-ion plasma system. The distinct masses of the positive and negative ions provoke mass-asymmetry in the Kappa-distributed bi-ion plasmas. The signature of the unique acoustic-laden twisted modes in non-Maxwellian asymmetric bi-ion plasma is perceived by the temperature of the lighter positive ions and the dynamics of the heavier negative ion. The deliberated results of Landau damping are displayed for distinct values of the azimuthal wave-number and spectral index, temperature-variation and mass-asymmetry.
The plasma modes are significantly influenced by the simple or/and molecular anions. The reciproc... more The plasma modes are significantly influenced by the simple or/and molecular anions. The reciprocity of beam and tri-ion electron (TIE) plasmas is modeled by the kinetic theory. The set of Vlasov–Poisson equation is solved and decomposed by the Laguerre–Gaussian function under paraxial approximation. The beam plasma expedites unstable twisted modes (UTMs) in the TIE plasma. The UTM or instability is calibrated via axial and azimuthal wave numbers, wind speed, and its growth essence. The qualitative and quantitative anatomy of the instability threshold is also predicted. Our model is eminently applicable to the space plasmas and has been applied to the Ar+ –F− –SF6− and Xe +–F−–SF6− electron plasmas, specifically.
The Kinetic Theory of non-Maxwellian Lang-muir modes is developed in the presence of Orbital Angu... more The Kinetic Theory of non-Maxwellian Lang-muir modes is developed in the presence of Orbital Angular Momentum. The Laguerre-Gaussian (LG) mode function is applied for the modeling of the non-Maxwellian twisted dielectric function to study the Landau wave-particle interaction in electron plasma system. In the last sention, some numercial results are also presented using appropriate parameters of electron plasma waves.
Twisted waves are usually characterized as the waves carrying orbital angular momentum (OAM). The... more Twisted waves are usually characterized as the waves carrying orbital angular momentum (OAM). The characteristic parameter of orbital angular momentum appears due to presence of helical electric field. The propagation of twisted waves is predominantly defined by the longitudinal and azimuthal wave numbers for the unmagnetized case. The longitudinal wave number reflects the variation in the spatial symmetry while the varying phase of non-planar helical wave fronts is shown by the azimuthal wave number.
The Landau damping rates of ion acoustic wave are studied by using Vlasov-Poisson model for unmag... more The Landau damping rates of ion acoustic wave are studied by using Vlasov-Poisson model for unmagnetized Lorentzian or kappa distributed plasma containing electrons, positively and negatively charged ions. It is found that the damping rate of ion acoustic wave is increased with the decrease of kappa (i.e., the spectral index of Lorentzian distribution) value. The damping rates of the electrostatic wave in multi-ion component plasmas are discussed in detail which depends on electron to ion temperature ratio and ions masses and density ratios. The numerical results are also shown by choosing some typical experimental parameters of multi-ion plasmas. V
In a three species electron-ion-dust plasma following a generalized non-Maxwellian distribution f... more In a three species electron-ion-dust plasma following a generalized non-Maxwellian distribution function (Lorentzian or kappa), it is shown that a kinetic instability of dust-acoustic mode exists. The instability threshold is affected when such (quasineutral) plasma permeates through another static plasma. Such case is of interest when the solar wind is streaming through the cometary plasma in the presence of interstellar dust. In the limits of phase velocity of the waves larger and smaller than the thermal velocity of dust particles, the dispersion properties and growth rate of dust-acoustic mode are investigated analytically with validation via numerical analysis.
Employing Vlasov-Poisson model for nonthermal distributed permeating plasma consisting of electro... more Employing Vlasov-Poisson model for nonthermal distributed permeating plasma consisting of electronpositron-ion plasma of our earth's magnetosphere and the solar wind plasma with some fixed streaming velocity, can drive ion-acoustic waves unstable. The growth rates are computed with respect to the variation in spectral index of the kappa or generalized Lorentzian distribution and streaming velocity of the solar wind. It is found that the growth rate increases with the decrease of spectral index and increases with the streaming velocity of the solar wind. The numerical results are also presented by choosing some suitable parameters.
The plasma modes are significantly influenced by the simple or/and molecular anions. The reciproc... more The plasma modes are significantly influenced by the simple or/and molecular anions. The reciprocity of beam and tri-ion electron (TIE) plasmas is modeled by the kinetic theory. The set of Vlasov–Poisson equation is solved and decomposed by the Laguerre–Gaussian function under paraxial approximation. The beam plasma expedites unstable twisted modes (UTMs) in the TIE plasma. The UTM or instability is calibrated via axial and azimuthal wave numbers, wind speed, and its growth essence. The qualitative and quantitative anatomy of the instability threshold is also predicted. Our model is eminently applicable to the space plasmas and has been applied to the Ar+–F−–[Formula: see text] and Xe+–F−–[Formula: see text] electron plasmas, specifically.
Alle rechten voorbehouden. Niets uit deze uitgave mag worden vermenigvuldigd en/of openbaar gemaa... more Alle rechten voorbehouden. Niets uit deze uitgave mag worden vermenigvuldigd en/of openbaar gemaakt worden door middel van druk, fotokopie, microfilm, elektronisch of op welke andere wijze ook zonder voorafgaande schriftelijke toestemming van de uitgever. All rights reserved. No part of the publication may be reproduced in any form by print, photoprint, microfilm, electronic or any other means without written permission from the publisher. PREFACE Tom Van Doorsselaere, Prof. dr. Rony Keppens for their social counselling during the coffee and lunch breaks, throughout my stay at KU Leuven, Belgium, and Prof. dr. Giovanni Lapenta to allow me to follow the wonderful course on Space Weather. I am also obliged to dr. Yana G. Maneva for her worthy collaborative projects for dusty plasmas and dr. Kirit Mukwana for his kind cooperation. I would like to present special thanks to dr. Shabaan M. Shabaan for his technical support in some research issues. Finally, I want to include the names of some very interactive colleagues like
Waves in bi-ion plasmas are affected by asymmetry. The kinetic theory of the Maxwellian and Loren... more Waves in bi-ion plasmas are affected by asymmetry. The kinetic theory of the Maxwellian and Lorentzian/Kappa-distributed bi-ion plasma is ameliorated to incorporate the transfer of orbital angular momentum from the helical electric field to the plasma modes. By operating the Laguerre-Gaussian (LG) function, the perturbed distribution function and helical electric field are decomposed into characteristic axial and azimuthal components. In symmetric bi-ion plasmas, the conventional ion modes/waves are only present if both ions have similar masses and the concentration of the electrons is negligible. An imbalance of the symmetry is considered by the contamination of a small fraction of the heavy immobile ions, which urges the negative ions to become heavier than the positive ions in the bi-ion plasma system. The distinct masses of the positive and negative ions provoke mass-asymmetry in the Kappa-distributed bi-ion plasmas. The signature of the unique acoustic-laden twisted modes in non-Maxwellian asymmetric bi-ion plasma is perceived by the temperature of the lighter positive ions and the dynamics of the heavier negative ion. The deliberated results of Landau damping are displayed for distinct values of the azimuthal wave-number and spectral index, temperature-variation and mass-asymmetry.
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Papers by Kashif Arshad
plasmas is modeled by the kinetic theory. The set of Vlasov–Poisson equation is solved and decomposed by the Laguerre–Gaussian function
under paraxial approximation. The beam plasma expedites unstable twisted modes (UTMs) in the TIE plasma. The UTM or instability
is calibrated via axial and azimuthal wave numbers, wind speed, and its growth essence. The qualitative and quantitative anatomy of the
instability threshold is also predicted. Our model is eminently applicable to the space plasmas and has been applied to the Ar+ –F− –SF6− and
Xe +–F−–SF6− electron plasmas, specifically.
plasmas is modeled by the kinetic theory. The set of Vlasov–Poisson equation is solved and decomposed by the Laguerre–Gaussian function
under paraxial approximation. The beam plasma expedites unstable twisted modes (UTMs) in the TIE plasma. The UTM or instability
is calibrated via axial and azimuthal wave numbers, wind speed, and its growth essence. The qualitative and quantitative anatomy of the
instability threshold is also predicted. Our model is eminently applicable to the space plasmas and has been applied to the Ar+ –F− –SF6− and
Xe +–F−–SF6− electron plasmas, specifically.