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This book 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

Magnetohydrodynamics --- Dynamo theory (Cosmic physics)

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The earthÆs magnetic field : its history, origin, and planetary perspective

Geomagnetism. --- Paleomagnetism. --- Dynamo theory (Cosmic physics)

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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.

Astrophysics. --- Cosmic magnetic fields. --- Dynamo theory (Cosmic physics). --- Dynamo theory (Cosmic physics) --- Cosmic magnetic fields --- Astrophysics --- Astronomy & Astrophysics --- Physical Sciences & Mathematics --- Stars --- Solar oscillations. --- Stellar oscillations. --- Magnetic fields. --- Sun. --- Pulsations of stars --- Stellar pulsations --- Intensity variations of the sun --- Oscillations of the sun --- Solar pulsations --- Solar variability --- Solar variations --- Magnetism, Stellar --- Stellar magnetic fields --- Stellar magnetism --- Oscillations --- Pulsations --- Physics. --- Optics. --- Electrodynamics. --- Plasma (Ionized gases). --- Magnetism. --- Magnetic materials. --- Statistical physics. --- Astrophysics and Astroparticles. --- Plasma Physics. --- Optics and Electrodynamics. --- Magnetism, Magnetic Materials. --- Nonlinear Dynamics. --- Solar system --- Astroseismology --- Pulsating stars --- Stellar oscillations --- Classical Electrodynamics. --- Applications of Nonlinear Dynamics and Chaos Theory. --- Mathematical physics --- Physics --- Electricity --- Magnetics --- Mathematical statistics --- Materials --- Dynamics --- Light --- Gaseous discharge --- Gaseous plasma --- Magnetoplasma --- Ionized gases --- Astronomical physics --- Astronomy --- Cosmic physics --- Statistical methods --- Nonlinear Optics. --- Optics, Nonlinear --- Optics --- Lasers