Theory And Simulation Of Magnetohydrodynamic Dynamos And Faraday Rotation For Plasmas Of General Composition
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Theory And Simulation Of Magnetohydrodynamic Dynamos And Faraday Rotation For Plasmas Of General Composition
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Author : Kiwan Park
language : en
Publisher:
Release Date : 2013
Theory And Simulation Of Magnetohydrodynamic Dynamos And Faraday Rotation For Plasmas Of General Composition written by Kiwan Park and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
"Many astrophysical phenomena depend on the underlying dynamics of magnetic fields. The observations of accretion disks and their jets, stellar coronae, and the solar corona are all best explained by models where magnetic fields play a central role. Understanding these phenomena requires studying the basic physics of magnetic field generation, magnetic energy transfer into radiating particles, angular momentum transport, and the observational implications of these processes. Each of these topics comprises a large enterprise of research. However, more practically speaking, the nonlinearity in large scale dynamo is known to be determined by magnetic helicity(A [dot] B), the topological linked number of knotted magnetic field. Magnetic helicity, which is also observed in solar physics, has become an important tool for observational and theoretical study. The first part of my work addresses one aspect of the observational implications of magnetic fields, namely Faraday rotation. It is shown that plasma composition affects the interpretation of Faraday rotation measurements of the field, and in turn how this can be used to help constrain unknown plasma composition. The results are applied to observations of astrophysical jets. The thesis then focuses on the evolution of magnetic fields. In particular, the dynamo amplification of large scale magnetic fields is studied with an emphasis on the basic physics using both numerical simulations and analytic methods. In particular, without differential rotation, a two and three scale mean field (large scale value + fluctuation scales) dynamo theory and statistical methods are introduced. The results are compared to magnetohydrodynamic (MHD) simulations of the Pencil code, which utilizes high order finite difference methods. Simulations in which the energy is initially driven into the system in the form of helical kinetic energy (via kinetic helicity) or helical magnetic energy (via magnetic helicity) reveal the exponential growth of seed magnetic fields by a mechanism known as 'alpha effect.' The generalized theory systematically explains the simulation results, showing how magnetic energy is inversely cascaded from small to large scales, and how the large scale field growth saturates. In addition to work on the nonlinear saturation of large scale magnetic fields, the thesis also includes a study of the influence of the magnitude and distribution of the magnetic energy on the large scale field growth rate in the last chapter. Since the large scale dynamos of most astrophysical objects are likely not yet in a resistively saturated state (due to the high conductivity of astrophysical plasmas), the evolution of the magnetic field in the pre-saturation regime is most important. The results show that, within the limitations of the present study, the effect of the initial field distribution on the large scale field growth is limited only to the early growth regime, not the saturated time regime"--Page iv-v.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1992
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Physics categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1985
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Aeronautics categories.
Documentation Of Plasma Physics Pt 1 Experimental Plasma Physics And Theoretical Plasma Physics
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Author :
language : en
Publisher:
Release Date : 1973
Documentation Of Plasma Physics Pt 1 Experimental Plasma Physics And Theoretical Plasma Physics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Plasma (Ionized gases) categories.
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1993
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Aeronautics categories.
Plasma Physics Index
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Author :
language : en
Publisher:
Release Date : 1982
Plasma Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Plasma (Ionized gases) categories.
Magnetohydrodynamics
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Author : Sergei S. Molokov
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-08-26
Magnetohydrodynamics written by Sergei S. Molokov and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-08-26 with Science categories.
This book revises the evolution of ideas in various branches of magnetohydrodynamics (astrophysics, earth and solar dynamos, pinch, MHD turbulence and liquid metals) and reviews current trends and challenges. Uniquely, it contains the review articles on the development of the subject by pioneers in the field as well as leading experts, not just in one, but in various branches of magnetohydrodynamics, such as liquid metals, astrophysics, dynamo and pinch.
Self Exciting Fluid Dynamos
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Author : Keith Moffatt
language : en
Publisher: Cambridge University Press
Release Date : 2019-04-25
Self Exciting Fluid Dynamos written by Keith Moffatt and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-25 with Mathematics categories.
Treats the origin of magnetic fields in planets, stars and galaxies, and the manner of their evolution over time.
Multiscale Coupling Of Sun Earth Processes
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Author : A.T.Y. Lui
language : en
Publisher: Elsevier
Release Date : 2005-07-06
Multiscale Coupling Of Sun Earth Processes written by A.T.Y. Lui and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-07-06 with Science categories.
Many approaches exist for scientific investigations and space research is no exception. The early approach during which each space plasma region within the Sun-Earth system was investigated separately with physics-based tools has now progressed to encompass investigations on coupling between these regions. Ample evidence now exists indicating the dynamic processes in these regions exhibit disturbances over a wide range of scales both in time and space. This new reckoning naturally leads to an emerging perspective of probing these natural phenomena with concepts and tools developed in modern statistical mechanics for physical processes governing the evolution of out-of-equilibrium and complex systems. These new developments have prompted a topical conference on Sun-Earth connection, held on February 9-13, 2004 at Kailua-Kona, Hawaii, USA, with the goal of promoting interactions among scientists practicing the traditional physics-based approach and those utilizing modern statistical techniques. This monograph is a product of this conference, a compilation of thirty-nine articles assembled into seven chapters: (1) multiscale features in complexity dynamics, (2) space storms, (3) magnetospheric substorms, (4) turbulence and magnetic reconnection, (5) modeling and coupling of space phenomena, (6) techniques for multiscale space plasma problems, and (7) present and future multiscale space missions. These articles show a diversity of space phenomena exhibiting scale free characteristics, intermittency, and non-Gaussian distributions of probability density function of fluctuations in the physical parameters of the Sun-Earth system. The scope covers the latest observations, theories, simulations, and techniques on the multiscale nature of Sun-Earth phenomena and underscores the usefulness in cross-disciplinary exchange needed to unravel the underlying physical processes, which may eventually lead to a possible unified description and prediction for space disturbances. * Extensive collection of state-of-the-art papers on multiscale coupling of Sun-Earth Processes * Present and future multiscale space missions * New techniques and models for performing multiscale analysis
Black Hole Accretion Disks
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Author : 加藤正二
language : en
Publisher: Trans Pacific Press
Release Date : 1998-02
Black Hole Accretion Disks written by 加藤正二 and has been published by Trans Pacific Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-02 with Science categories.