The authors acknowledge the financial support received from the Spanish MICINN/MINECO and FEDER funds under Grant No. AYA2006-07637 and AYA2011-22486. They also thank R. Soler for providing some of the figures of this review.
All figures from Astronomy and Astrophysics reproduced with permission Ⓒ ESO; from The Astrophysical Journal and The Astrophysical Journal Letters reproduced by permission of the AAS; from Geophysical & Astrophysical Fluid Dynamics reprinted by permission of Taylor & Francis Ltd.; from Science reprinted with permission from AAAS; and from Solar Physics reproduced with kind permission from Springer Science+Business Media B.V.
Living Rev. Solar Phys. 9, (2012), 2
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