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Beam Plasma Interaction and Nonlinear Processes in Solar Wind Plasma
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- Author / Creator
- HOSSAIN, MD MANIR
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Langmuir amplitude modulations and harmonic waves, generated by solar wind electron beams, are commonly observed in type III solar radio bursts. Various mechanisms have been proposed for the origin of these waves, but there is still ongoing debate on how the observation of continuous type III radiation over large distances, e.g., from Sun to Earth, can be reconciled with the picture of fast beam stabilization by plateau formation. In this context, the occurrence of current-driven Langmuir oscillations in plasmas with plateau distributions offers a relatively simple mechanism of electromagnetic emission. The saturation process of the beam instability is accompanied with the formation of a plateau distribution and the saturated state represents a current which drives homogeneous electric field oscillations at the plasma frequency. A plasma system composed of main and beam plasma electrons with finite temperature is considered and Ampere’s law is used instead of Poisson’s equation to describe the mechanism of current drive in plasmas. Results of using Poisson's equation and Ampere’s law are compared by using particle-in-cell simulations. Possible modulational instabilities that generate solitary structure are investigated. Theoretical and simulation results are compared with space observations.
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- Graduation date
- Fall 2018
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.