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      Articles written in Pramana – Journal of Physics

    • Nonlinear waves in electron–positron–ion plasmas including charge separation

      A MUGEMANA S MOOLLA I J LAZARUS

      More Details Abstract Fulltext PDF

      Nonlinear low-frequency electrostatic waves in a magnetized, three-component plasma consisting of hot electrons, hot positrons and warm ions have been investigated. The electrons and positrons are assumed to have Boltzmann density distributions while the motion of the ions are governed by fluid equations. The system is closed with the Poisson equation. This set of equations is numerically solved for the electric field. The effects of the driving electric field, ion temperature, positron density, ion drift, Mach number and propagation angle are investigated. It is shown that depending on the driving electric field, ion temperature, positron density, ion drift, Mach number and propagation angle, the numerical solutions exhibit waveforms that are sinusoidal, sawtooth andspiky. The introduction of the Poisson equation increased the Mach number required to generate the waveforms but the driving electric field E0 was reduced. The results are compared with satellite observations.

    • Nonlinear waves in electron–positron–ion plasmas including the full dynamics for all species

      A MUGEMANA S MOOLLA I J LAZARUS

      More Details Abstract Fulltext PDF

      Nonlinear low-frequency electrostatic waves in a magnetised, three-component plasma consisting of warm electrons,warm positrons and cool ions have been investigated. The electrons, positrons and ions are governed by the fluid equations. The system is closed with the Poisson equation. This set of equations is numerically solved for the electric field. The effects of the driving electric field, ion temperature, densities, Mach number, propagation angle and drift velocity of different species are investigated. It is shown that depending on the driving electric field, temperature, densities, Mach number, propagation angle and drift velocity of different species on the nonlinear wave structures components, the numerical solutions exhibit waveforms that are sinusoidal, saw-tooth and spiky. The results are compared with satellite observations.

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