Theory And Simulation Of The Evolution Of The Large Scale Solar Magnetic Field
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Theory And Simulation Of The Evolution Of The Large Scale Solar Magnetic Field
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Author : Carl Richard DeVore
language : en
Publisher:
Release Date : 1986
Theory And Simulation Of The Evolution Of The Large Scale Solar Magnetic Field written by Carl Richard DeVore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Solar magnetic fields categories.
The Origin And Dynamics Of Solar Magnetism
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Author : M.J. Thompson
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-05-01
The Origin And Dynamics Of Solar Magnetism written by M.J. Thompson 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 2009-05-01 with Science categories.
Starting in 1995 numerical modeling of the Earth’s dynamo has ourished with remarkable success. Direct numerical simulation of convection-driven MHD- ow in a rotating spherical shell show magnetic elds that resemble the geomagnetic eld in many respects: they are dominated by the axial dipole of approximately the right strength, they show spatial power spectra similar to that of Earth, and the magnetic eld morphology and the temporal var- tion of the eld resembles that of the geomagnetic eld (Christensen and Wicht 2007). Some models show stochastic dipole reversals whose details agree with what has been inferred from paleomagnetic data (Glatzmaier and Roberts 1995; Kutzner and Christensen 2002; Wicht 2005). While these models represent direct numerical simulations of the fundamental MHD equations without parameterized induction effects, they do not match actual pla- tary conditions in a number of respects. Speci cally, they rotate too slowly, are much less turbulent, and use a viscosity and thermal diffusivity that is far too large in comparison to magnetic diffusivity. Because of these discrepancies, the success of geodynamo models may seem surprising. In order to better understand the extent to which the models are applicable to planetary dynamos, scaling laws that relate basic properties of the dynamo to the fundamental control parameters play an important role. In recent years rst attempts have been made to derive such scaling laws from a set of numerical simulations that span the accessible parameter space (Christensen and Tilgner 2004; Christensen and Aubert 2006).
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.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
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 1994 with Aeronautics categories.
Investigating The Evolution Of The Large Scale Cyclic Solar Magnetic Fields By Babcock Leighton Flux Transport Dynamo Model
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Author : Belucz Bernadett
language : en
Publisher:
Release Date : 2016
Investigating The Evolution Of The Large Scale Cyclic Solar Magnetic Fields By Babcock Leighton Flux Transport Dynamo Model written by Belucz Bernadett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Solar Magnetic Fields
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Author : Manfred Schüssler
language : en
Publisher: Cambridge University Press
Release Date : 1994-06-16
Solar Magnetic Fields written by Manfred Schüssler 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 1994-06-16 with Science categories.
How are large-scale magnetic fields generated in the Sun in self-excited dynamo processes? And how are magnetic structures spontaneously formed in the Sun and how do they interact with the convective flows, storage and release of magnetic energy? These are just several of the fundamental questions answered in this timely review of our understanding of solar magnetic fields. This volume collects together review articles and research papers from an international conference, held in Freiburg, Germany, dedicated to the study of magnetic fields in the Sun. From large-scale patterns and global dynamo action to tiny flux tubes, from the overshoot layer below the convection zone up to the corona, and from instrumental problems and theoretical methods to the latest ground-based and satellite observations, this volume provides an essential review of our knowledge to date for graduate students and researchers.
Solar And Stellar Magnetic Activity
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Author : C. J. Schrijver
language : en
Publisher: Cambridge University Press
Release Date : 2008-10-30
Solar And Stellar Magnetic Activity written by C. J. Schrijver 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 2008-10-30 with Science categories.
This timely volume provides the first comprehensive review and synthesis of current understanding of magnetic fields in the Sun and similar stars. Magnetic activity results in a wealth of phenomena - including starspots, non-radiatively heated outer atmospheres, activity cycles, deceleration of rotation rates, and even, in close binaries, stellar cannibalism - all of which are covered clearly and authoritatively. This book brings together for the first time recent results in solar studies and stellar studies. The result is an illuminating new view of stellar magnetic activity. Key topics include radiative transfer, convective simulations, dynamo theory, outer-atmospheric heating, stellar winds and angular momentum loss. Researchers are provided with a state-of-the-art review of this exciting field, and the pedagogical style and introductory material make the book an ideal and welcome introduction for graduate students.
Global Evolution Of Magnetic Fields In The Photosphere Of The Sun During Cycles 20 23
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Author : Reto Knaack
language : en
Publisher: Cuvillier Verlag
Release Date : 2005
Global Evolution Of Magnetic Fields In The Photosphere Of The Sun During Cycles 20 23 written by Reto Knaack and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Literature 1987 Part 1
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Author : S. Böhme
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Literature 1987 Part 1 written by S. Böhme 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 2013-11-11 with Science categories.
Astronomy and Astrophysics Abstracts aims to present a comprehensive documen tation of the literature concerning all aspects of astronomy, astrophysics, and their border fields. It is devoted to the recording, summarizing, and indexing of the relevant publications throughout the world. Astronomy and Astrophysics Abstracts is prepared by a special department of the Astronomisches Rechen-Institut under the auspices of the International Astronomical Union. Volume 43 records literature published in 1987 and received before August 15, 1987. Some older documents which we received late and which are not surveyed in earlier volumes are included too. We acknowledge with thanks contributions of our colleagues all over the world. We also express our gratitude to all organiza tions, observatories, and publishers which provide us with complimentary copies of their publications. Starting with Volume 33, all the recording, correction, and data processing work was done by means of computers. The recording was done by our technical staff members Ms. Helga Ballmann, Ms. Beate Gobel, Ms. Monika Kohl, Ms. Sylvia Matyssek, Ms. Doris Schmitz-Braunstein, Ms. Utta-Barbara Stegemann. Mr. Jochen Heidt and Mr. Kristopher Polzine supported our task by careful proof reading. It is a pleasure to thank them all for their encouragement. Heidelberg, October 1987 The Editors Contents Introduction . . . . . . . . . . . 1 Concordance Relation: PHYS-AAA 3 Abbreviations 5 Periodicals, Proceedings, Books, Activities 001 Periodicals . . . . . . . . . . . 10 002 Bibliographical Publications, Documentation, Catalogues, Data Bases 50 003 Books ...... .
Structure And Evolution Of The Large Scale Solar And Heliospheric Magnetic Fields
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Author : Jon Todd Hoeksema
language : en
Publisher:
Release Date : 1984
Structure And Evolution Of The Large Scale Solar And Heliospheric Magnetic Fields written by Jon Todd Hoeksema and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Cosmic magnetic fields categories.