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Author : F. Krause,K.-H. Rädler,G. Rüdiger
Publisher : Springer Science & Business Media
Page : 479 pages
File Size : 50,5 Mb
Release : 2013-12-01
Category : Science
ISBN : 9789401107723
Proceedings of the 157th Symposium of the International Astronomical Union held in Potsdam, Germany, September 7--11, 1992
Author : Paul Charbonneau
Publisher : Springer
Page : 240 pages
File Size : 54,5 Mb
Release : 2012-11-06
Category : Science
ISBN : 9783642320934
Astrophysical dynamos are at the heart of cosmic magnetic fields of a wide range of scales, from planets and stars to entire galaxies. This book presents a thorough, step-by-step introduction to solar and stellar dynamos. Looking first at the ultimate origin of cosmic seed magnetic fields, the antagonists of field amplification are next considered: resistive decay, flux expulsion, and flows ruled out by anti-dynamo theorems. Two kinematic flows that can act as dynamos are then studied: the Roberts cell and the CP-flow. Mean-field electrodynamics and derivation of the mean-field dynamo equations lead to the alpha Omega-dynamo, the flux transport dynamo, and dynamos based on the Babcock-Leighton mechanism. Alternatives to the mean-field theory are also presented, as are global MHD dynamo simulations. Fluctuations and grand minima in the solar cycle are discussed in terms of dynamo modulations through stochastic forcing and nonlinear effects. The book concludes with an overview of the major challenges in understanding stellar magnetic fields and their evolution in terms of various dynamo models, global MHD simulations, and fossil fields. Each chapter is accompanied by an annotated bibliography, guiding the readers to the relevant technical literature, which may lead them to carry out their own research in the field of dynamo theory.
Author : M. R. E. Proctor,A. D. Gilbert
Publisher : Cambridge University Press
Page : 396 pages
File Size : 55,6 Mb
Release : 1994-12-08
Category : Mathematics
ISBN : 0521467047
Comprised of lectures for an intensive course held at the Newton Institute in Cambridge, as part of a NATO Advanced Study Institute, the topics covered within this volume include planetary and solar dynamos, fast dynamos, and the use of symmetry principles to derive evolution equations.
Author : Antonio Ferriz-Mas,Manuel Nunez
Publisher : CRC Press
Page : 343 pages
File Size : 47,6 Mb
Release : 2019-04-24
Category : Science
ISBN : 9781134443901
Nonlinear dynamo theory is central to understanding the magnetic structures of planets, stars and galaxies. In chapters contributed by some of the leading scientists in the field, this text explores some of the recent advances in the field. Both kinetic and dynamic approaches to the subject are considered, including fast dynamos, topological methods in dynamo theory, physics of the solar cycle and the fundamentals of mean field dynamo. Advances in Nonlinear Dynamos is ideal for graduate students and researchers in theoretical astrophysics and applied mathematics, particularly those interested in cosmic magnetism and related topics, such as turbulence, convection, and more general nonlinear physics.
Author : Dany Page,Jorge G. Hirsch
Publisher : Springer
Page : 348 pages
File Size : 50,7 Mb
Release : 2008-01-11
Category : Science
ISBN : 9783540453710
The enormous advances in observational techniques over the last two decades has produced a wealth of data and unexpected discoveries which have helped to reshape astrophysics as a field with well-formulated theories and sophisticated numerical calculations. In nuclear particle physics, plasma physics, as well as in general relativity, the Universe has become a laboratory for cutting-edge research. The courses collected in the book are intended to provide students with this insight, giving a general background on each topic such as cosmic rays, nuclear and neutrino astrophysics, solar physics and strong fields, as well as a presentation of the current research and open problems. The book is aimed at graduate students in physics and astrophysics, as well as researchers, bridging a gap between the specialized reviews and the comprehensive books.
Author : Stephen Childress,Andrew D. Gilbert
Publisher : Springer Science & Business Media
Page : 414 pages
File Size : 48,7 Mb
Release : 2008-09-11
Category : Science
ISBN : 9783540447788
The study of the magnetic fields of the Earth and Sun, as well as those of other planets, stars, and galaxies, has a long history and a rich and varied literature, including in recent years a number of review articles and books dedicated to the dynamo theories of these fields. Against this background of work, some explanation of the scope and purpose of the present monograph, and of the presentation and organization of the material, is therefore needed. Dynamo theory offers an explanation of natural magnetism as a phenomenon of magnetohydrodynamics (MHD), the dynamics governing the evolution and interaction of motions of an electrically conducting fluid and electromagnetic fields. A natural starting point for a dynamo theory assumes the fluid motion to be a given vector field, without regard for the origin of the forces which drive it. The resulting kinematic dynamo theory is, in the non-relativistic case, a linear advection-diffusion problem for the magnetic field. This kinematic theory, while far simpler than its magnetohydrodynamic counterpart, remains a formidable analytical problem since the interesting solutions lack the easiest symmetries. Much ofthe research has focused on the simplest acceptable flows and especially on cases where the smoothing effect of diffusion can be exploited. A close analog is the advection and diffusion of a scalar field by laminar flows, the diffusion being measured by an appropriate Peclet number. This work has succeeded in establishing dynamo action as an attractive candidate for astrophysical magnetism.
Author : Pascal Chossat,Dieter Armbruster,Iuliana Oprea
Publisher : Springer Science & Business Media
Page : 399 pages
File Size : 54,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789401007887
This book contains the lectures given at the workshop "Dynamo and dynamics, a mathematical challenge" held in Cargese from August 21 to 26, 2000. The workshop differed from most previous conferences on the dynamo effect in two important respects. First, it was at this international conference that the experimental observation of homogeneous fluid dynamos was first reported. Second, the conference gathered scientists from very different fields, thus showing that thepynamo problem has become an interdisciplinary subject involving not only astrophysicists and geophysicists, but also scientists working in dynamical systems theory, hydrodynamics, and numerical simulation, as well as several groups in experimental physics. This book thus reports important results on various dynamo studies in these different contexts: - Decades after the discovery of the first analytic examples of laminar fluid dynamos, the self-generation of a magnetic field by a flow ofliquid sodium has been reported by the Karlsruhe and Riga groups. Although there were no doubts concerning the self generation by the laminar Roberts-type or Ponomarenko-type flows that were used, these experiments have raised interesting questions about the influence of the turbulent fluctuations on the dynamo threshold and on the saturation level of the magnetic field.
Author : Kanaris Tsinganos
Publisher : Springer Science & Business Media
Page : 770 pages
File Size : 49,5 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789400902657
Modern observations, including recent ones with the Hubble Space Telescope, have revealed that the Universe is replete with plasma outflows from all kinds of objects, ranging from stars in all their variety to galaxies. In this masterly survey of plasma astrophysics, written by leading practitioners, the first 15 articles in Part I deal with the use of the MHD approach in several key problems of solar plasma, such as magnetoconvection and magnetic field generation, sunspots and coronal loops, magnetic nonequilibrium and coronal heating, coronal mass ejections, the acceleration of the solar wind, and stellar winds across the Main Sequence. The following 16 articles of Part II deal with the use of the same MHD approach in several central and puzzling aspects of more distant astrophysical plasmas, such as the dynamics of the interstellar medium, collimated outflows from young stellar objects and accretion disks, molecular outflows and jets associated with enigmatic binaries and symbiotic stars, relativistic flows associated with superluminal microquasars in our own galaxy, astrophysical jets from nearby galaxies, or remote active galactic nuclei and quasars, probably fuelled by supermassive black holes. The emphasis throughout is on the striking underlying similarities in the physics of all these problems. Audience: Indispensable for solar physicists and astrophysics alike. An ideal textbook for graduate students in physics and astrophysics.
Author : Emmanuel Dormy,Andrew M. Soward
Publisher : CRC Press
Page : 494 pages
File Size : 41,9 Mb
Release : 2007-06-11
Category : Science
ISBN : 9781420055269
Although the origin of Earth's and other celestial bodies' magnetic fields remains unknown, we do know that the motion of electrically conducting fluids generates and maintains these fields, forming the basis of magnetohydrodynamics (MHD) and, to a larger extent, dynamo theory. Answering the need for a comprehensive, interdisciplinary introduction
Author : Yutaka Uchida,Takeo Kosugi,Hugh S. Hudson
Publisher : Springer Science & Business Media
Page : 630 pages
File Size : 50,5 Mb
Release : 2013-11-11
Category : Science
ISBN : 9789400903159
These are the Proceedings of Colloquium No. 153 of the International Astro nomical Union, held at Makuhari near Tokyo on May 22 - 26, 1995, and hosted by the National Astronomical Observatory. This meeting was intended to be an interdisciplinary meeting between re searchers of solar and stellar activity, in order for them to exchange the newest information in each field. While each of these areas has seen remarkable advances in recent years, and while the researchers in each field have felt that information from the other's domain would be extremely useful in their own work, there have not been very many opportunities for intensive exchanges of information between these closely related fields. We therefore expected much from this meeting in pro viding stellar researchers with new results of research on the counterparts of their targets of research, spatially and temporarily resolved, as observed on the Sun. Likewise we hoped to provide solar researchers with new results on gigantic ver sions of their targets of research under the very different physical circumstances on other active stars. It was our greatest pleasure that we had wide attendance of experts and active researchers of both research fields from all over the world. This led to extremely interesting talks and very lively discussions, thereby stimulating the exchange of ideas across the fields.
Author : M.J. Thompson,A. Balogh,J.L. Culhane,Å. Nordlund,S.K. Solanki,J.-P. Zahn
Publisher : Springer Science & Business Media
Page : 424 pages
File Size : 50,5 Mb
Release : 2009-05-01
Category : Science
ISBN : 9781441902399
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).
Author : Alexander G. Kosovichev,Yihua Yan,Elisabete de Gouveia Dal Pino,Lidia van Driel-Gesztelyi
Publisher : Cambridge University Press
Page : 0 pages
File Size : 53,7 Mb
Release : 2013-09-12
Category : Science
ISBN : 1107033837
Global magnetic fields in planets, in the Sun and other stars, in spiral galaxies and galaxy clusters are believed to be generated and maintained by a hydromagnetic dynamo, a process that converts turbulent kinetic energy into magnetic energy. These dynamo processes operate on drastically different scales, but are associated with common physical mechanisms, involving a complex interaction of rotation, turbulence and instabilities. The goal of IAU Symposium 294 was to discuss the most important results of recent studies of the cosmic dynamo processes, from planets to stars, galaxies, and clusters of galaxies. This volume covers advances in dynamo theories and numerical simulations, links between dynamos and turbulence, the origin of magnetic fields, and current and future observational projects. The proceedings of IAU S294 are an important asset for advanced students and researchers, as a summary of hot topics related to the solar and astrophysical dynamos and magnetic activity.
Author : David Gubbins,Emilio Herrero-Bervera
Publisher : Springer Science & Business Media
Page : 1061 pages
File Size : 53,9 Mb
Release : 2007-07-19
Category : Science
ISBN : 9781402044236
This reference encompasses the fields of Geomagnetism and Paleomagnetism in a single volume. Both sciences have applications in navigation, in the search for minerals and hydrocarbons, in dating rock sequences, and in unraveling past geologic movements such as plate motions they have contributed to a better understanding of the Earth. The book describes in fine detail the current state of knowledge and provides an up-to-date synthesis of the most basic concepts. It is an indispensable working tool not only for geophysicists and geophysics students but also for geologists, physicists, atmospheric and environmental scientists, and engineers.
Author : Neil Turok
Publisher : World Scientific
Page : 626 pages
File Size : 41,5 Mb
Release : 1997-08-04
Category : Electronic
ISBN : 9789814547154
A special forum on critical issues in cosmology in celebraton of Princeton University's 250th birthday.The proceedings of this conference, held as part of Princeton University's 250th birthday celebrations, features lectures and discussions by many of the world's leading scientists on the status and future of modern cosmology.The volume offers the non-specialist a fascinating insight into the current status of cosmology and the issues of contention at the research frontiers of the science. It constitutes the proceedings of a special conference, held as part of Princeton University's 250 birthday celebrations, featuring lectures and discussions by many of the world's leading scientists on the status and future of modern cosmology. The volume is based on the format of a series of debates in which a range of conventional wisdom is reviewed, defended and critcised by renowned specialists in each field.The technical level of the volume is accessible to a very broad audience of non-specialists. This innovative exchange of ideas at the cutting edge of cosmology therefore offers an unusual opportunity for the average reader to savour the excitement of probing into the ultimate secrets of the universe.
Author : Anonim
Publisher : Elsevier
Page : 497 pages
File Size : 43,6 Mb
Release : 2011-07-29
Category : Science
ISBN : 9780080560533
Dynamos is a collection of lectures given in July 2007 at the Les Houches Summer School on "Dynamos". Provides a pedagogical introduction to topics in Dynamos Addresses each topic from the basis to the most recent developments Covers the lectures by internationally-renowned and leading experts