PREFACE -- FOUNDATIONS OF DYNAMO THEORY -- Introduction to Self-Excited Dynamo Action -- Governing equations -- Homogeneous dynamos -- Necessary conditions for dynamo action -- Steady and time-dependent velocities -- Two-scale dynamos -- Large magnetic Reynolds numbers -- Nonlinearities and Saturation -- General considerations -- Saturation of a dynamo generated by a periodic flow -- Saturation in the low Re limit in the vicinity of the dynamo threshold -- Saturation in the high Re limit in the vicinity of the dynamo threshold -- Effect of rotation -- Scaling laws in the limit of large Rm and Re -- Nonlinear effects in mean field dynamo theory -- Physically realistic Faraday-disc self-excited dynamos -- Dynamics of Rotating Fluids -- Boundary and shear layers in rotating flows -- Boundary and shear layers in rotating MHD flows -- Waves -- Convection in rotating spherical fluid shells -- NATURAL DYNAMOS AND MODELS -- The Geodynamo -- The Earth and its magnetic field -- Governing equations and parameters -- Fundamental theoretical results -- Parameter constraints -- Numerical models -- Turbulence in the Earth's core: the ends justify the means? -- Preliminary considerations on turbulence -- The traditional approach to turbulence -- The engineering approach to turbulence -- Where are we now, and the future -- Planetary Dynamos -- Observations of planetary magnetic fields -- Some outstanding problems in planetary dynamo theory -- Conditions needed for dynamo action in planets -- Energy sources for planetary dynamos -- Internal structure of the planets -- Dynamics of planetary interiors -- Numerical dynamo models for the planets -- Stellar Dynamos -- Stellar magnetic activity -- Linear a?-dynamos for the solar cycle -- Nonlinear quenching mechanisms -- Interface dynamos -- Modulation of cyclic activity -- Rapidly rotating stars -- The future -- Galactic Dynamos -- Introduction -- Interstellar medium in spiral galaxies -- Magnetic fields observed in galaxies -- The origin of galactic magnetic fields -- Observational evidence for the origin of galactic magnetic fields -- Elliptical galaxies -- Accretion discs -- Conclusions -- Survey of Experimental Results -- Introduction -- Description of the experiments -- What have we learned from the experimental approach? -- Conclusions -- Prospects -- Appendix A: Vectors and coordinates -- Appendix B: Poloidal-Toroidal decomposition -- Appendix C: Taylor's constraint -- Appendix D: Units -- Appendix E: Abbreviations -- References -- Reference Index -- Subject Index.