Solar and Stellar Dynamos: Saas-Fee Advanced Course 39 Swiss Society for Astrophysics and Astronomy

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Springer, Nov 6, 2012 - Science - 240 pages

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.

 

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Contents

1 Magnetohydrodynamics
1
2 Decay and Amplification of Magnetic Fields
37
3 Dynamo Models of the Solar Cycle
87
4 Fluctuations Intermittency and Predictivity
152
5 Stellar Dynamos
187
Appendix A Useful Identities and Theorems from Vector Calculus
215
Appendix B Coordinate Systems and the Fluid Equations
217
Appendix C Physical and Astronomical Constants
226
Appendix D Maxwells Equations and Physical Units
229
Index
233
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About the author (2012)

Paul Charbonneau is a professor in the astrophysics group of the physics department of the University of Montréal. He has been working on solar activity and its possible influence on the Earth climate.

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