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Self-Exciting Fluid Dynamos

Released on 2019-04-30
Self-Exciting Fluid Dynamos

Author: Keith Moffatt

Publisher: Cambridge University Press

ISBN: 9781107065871

Category: Mathematics

Page: 544

View: 434

Treats the origin of magnetic fields in planets, stars and galaxies, and the manner of their evolution over time.

Self-Exciting Fluid Dynamos

Released on 2019-04-25
Self-Exciting Fluid Dynamos

Author: Keith Moffatt

Publisher: Cambridge University Press

ISBN: 9781108636834

Category: Science

Page:

View: 963

Exploring the origins and evolution of magnetic fields in planets, stars and galaxies, this book gives a basic introduction to magnetohydrodynamics and surveys the observational data, with particular focus on geomagnetism and solar magnetism. Pioneering laboratory experiments that seek to replicate particular aspects of fluid dynamo action are also described. The authors provide a complete treatment of laminar dynamo theory, and of the mean-field electrodynamics that incorporates the effects of random waves and turbulence. Both dynamo theory and its counterpart, the theory of magnetic relaxation, are covered. Topological constraints associated with conservation of magnetic helicity are thoroughly explored and major challenges are addressed in areas such as fast-dynamo theory, accretion-disc dynamo theory and the theory of magnetostrophic turbulence. The book is aimed at graduate-level students in mathematics, physics, Earth sciences and astrophysics, and will be a valuable resource for researchers at all levels.

Nature's Third Cycle

Released on 2015
Nature's Third Cycle

Author: Arnab Rai Choudhuri

Publisher: Oxford University Press, USA

ISBN: 9780199674756

Category: Science

Page: 281

View: 128

The cycle of day and night and the cycle of seasons are two familiar natural cycles around which many human activities are organized. But is there a third natural cycle of importance for us humans? On 13 March 1989, six million people in Canada went without electricity for many hours: a large explosion on the sun was discovered as the cause of this blackout. Such explosions occur above sunspots, dark features on the surface of the Sun that have been observed through telescopes since the time of Galileo. The number of sunspots has been found to wax and wane over a period of 11 years. Although this cycle was discovered less than two centuries ago, it is becoming increasingly important for us as human society becomes more dependent on technology. For nearly a century after its discovery, the cause of the sunspot cycle remained completely shrouded in mystery. The 1908 discovery of strong magnetic fields in sunspots made it clear that the 11-year cycle is the magnetic cycle of the sun. It is only during the last few decades that major developments in plasma physics have at last given us the clue to the origins of the cycle and how the large explosions affecting the earth arise. Nature's Third Cycle discusses the fascinating science behind the sunspot cycle, and gives an insider's perspective of this cutting-edge scientific research from one of the leaders of the field.

Magneto-Fluid Dynamics

Released on 2007-10-31
Magneto-Fluid Dynamics

Author: Paul Lorrain

Publisher: Springer Science & Business Media

ISBN: 9780387472904

Category: Science

Page: 319

View: 175

This book provides an understanding of the physics at work in sunspots and solar coronal loops, and offers a new approach to Magneto-Fluid-Dynamics (or Magneto-Hydro-Dynamics).The book stresses the use of electric currents in Magneto-Fluid-Dynamics. As a rule, authors discuss magnetic field lines without referring to the required electric currents. It also stresses the importance of electric space charges inside conductors that move in magnetic fields.

Mean-Field Magnetohydrodynamics and Dynamo Theory

Released on 2016-01-22
Mean-Field Magnetohydrodynamics and Dynamo Theory

Author: F. Krause

Publisher: Elsevier

ISBN: 9781483158068

Category: Science

Page: 272

View: 983

Mean-Field Magnetohydrodynamics and Dynamo Theory provides a systematic introduction to mean-field magnetohydrodynamics and the dynamo theory, along with the results achieved. Topics covered include turbulence and large-scale structures; general properties of the turbulent electromotive force; homogeneity, isotropy, and mirror symmetry of turbulent fields; and turbulent electromotive force in the case of non-vanishing mean flow. The turbulent electromotive force in the case of rotational mean motion is also considered. This book is comprised of 17 chapters and opens with an overview of the general concept of mean-field magnetohydrodynamics, followed by a discussion on the back-reaction of the magnetic field on motion; the structure of the turbulent electromotive force; homogeneous and two-scale turbulence; turbulent electromotive force in the case of rotational mean motion; and the dynamo problem of magnetohydrodynamics. The dynamo theory, which is based on mean-field magnetohydrodynamics, is explained and its applications to cosmical objects are described. The remaining chapters explore toroidal and poloidal vector fields; a simple model of an α-effect dynamo; and spherical models of turbulent dynamos as suggested by cosmical bodies. This monograph will be of interest to physicists.

Fluid Mechanics of Planets and Stars

Released on 2019-06-29
Fluid Mechanics of Planets and Stars

Author: Michael Le Bars

Publisher: Springer

ISBN: 9783030220747

Category: Technology & Engineering

Page: 241

View: 475

This book explores the dynamics of planetary and stellar fluid layers, including atmospheres, oceans, iron cores, and convective and radiative zones in stars, describing the different theoretical, computational and experimental methods used to study these problems in fluid mechanics, including the advantages and limitations of each method for different problems. This scientific domain is by nature interdisciplinary and multi-method, but while much effort has been devoted to solving open questions within the various fields of mechanics, applied mathematics, physics, earth sciences and astrophysics, and while much progress has been made within each domain using theoretical, numerical and experimental approaches, cross-fertilizations have remained marginal. Going beyond the state of the art, the book provides readers with a global introduction and an up-to-date overview of relevant studies, fully addressing the wide range of disciplines and methods involved. The content builds on the CISM course “Fluid mechanics of planets and stars”, held in April 2018, which was part of the research project FLUDYCO, supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program.

Mosaic

Released on 1982
Mosaic

Author:

Publisher:

ISBN: MINN:30000011054917

Category: Science

Page:

View: 791

Turbulence in Rotating, Stratified and Electrically Conducting Fluids

Released on 2013-09-12
Turbulence in Rotating, Stratified and Electrically Conducting Fluids

Author: P. A. Davidson

Publisher: Cambridge University Press

ISBN: 9781107434349

Category: Science

Page: 690

View: 585

There are two recurring themes in astrophysical and geophysical fluid mechanics: waves and turbulence. This book investigates how turbulence responds to rotation, stratification or magnetic fields, identifying common themes, where they exist, as well as the essential differences which inevitably arise between different classes of flow. The discussion is developed from first principles, making the book suitable for graduate students as well as professional researchers. The author focuses first on the fundamentals and then progresses to such topics as the atmospheric boundary layer, turbulence in the upper atmosphere, turbulence in the core of the earth, zonal winds in the giant planets, turbulence within the interior of the sun, the solar wind, and turbulent flows in accretion discs. The book will appeal to engineers, geophysicists, astrophysicists and applied mathematicians who are interested in naturally occurring turbulent flows.

An Introduction to Magnetohydrodynamics

Released on 2001-03-05
An Introduction to Magnetohydrodynamics

Author: P. A. Davidson

Publisher: Cambridge University Press

ISBN: 0521794870

Category: Mathematics

Page: 431

View: 467

This book is an introductory text on magnetohydrodynamics (MHD) - the study of the interaction of magnetic fields and conducting fluids.

Introduction to Magnetohydrodynamics

Released on 2016-12-22
Introduction to Magnetohydrodynamics

Author: P. A. Davidson

Publisher: Cambridge University Press

ISBN: 9781107160163

Category: Science

Page: 498

View: 865

Comprehensive textbook prioritising physical ideas over mathematical detail. New material includes fusion plasma magnetohydrodynamics.

Astrophysical Magnetic Fields

Released on 2021-12-16
Astrophysical Magnetic Fields

Author: Anvar Shukurov

Publisher: Cambridge University Press

ISBN: 9781009234122

Category: Science

Page: 642

View: 887

Magnetic fields permeate space and affect many major astrophysical phenomena, but they are often ignored due to their perceived complexity. This self-contained introduction to astrophysical magnetic fields provides both a comprehensive review of the current state of the subject and a critical discussion of the latest research. It presents our knowledge of magnetic fields from the Early Universe, their evolution in cosmic time through to their roles in present-day galaxies, galaxy clusters and the wider intergalactic medium, with attention given to both theory and observations. This volume also contains an extensive introduction into magnetohydrodynamics, numerous worked examples, observational and mathematical techniques and interpretations of the observations. Its review of our current knowledge, with an emphasis on results that are likely to form the basis for future progress, benefits a broad audience of advanced students and active researchers, including those from fields such as cosmology and general relativity.

Introduction to Turbulent Transport of Particles, Temperature and Magnetic Fields

Released on 2021-07-31
Introduction to Turbulent Transport of Particles, Temperature and Magnetic Fields

Author: Igor Rogachevskii

Publisher: Cambridge University Press

ISBN: 9781009008419

Category: Science

Page:

View: 355

Turbulence and the associated turbulent transport of scalar and vector fields is a classical physics problem that has dazzled scientists for over a century, yet many fundamental questions remain. Igor Rogachevskii, in this concise book, systematically applies various analytical methods to the turbulent transfer of temperature, particles and magnetic field. Introducing key concepts in turbulent transport including essential physics principles and statistical tools, this interdisciplinary book is suitable for a range of readers such as theoretical physicists, astrophysicists, geophysicists, plasma physicists, and researchers in fluid mechanics and related topics in engineering. With an overview to various analytical methods such as mean-field approach, dimensional analysis, multi-scale approach, quasi-linear approach, spectral tau approach, path-integral approach and analysis based on budget equations, it is also an accessible reference tool for advanced graduates, PhD students and researchers.

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