Solar and astrophysical dynamos and magnetic activity : proceedings of the 294th Symposium of the International Astronomical Union, held in Beijing, China, August 27-31, 2012 / edited by Alexander G. Kosovichev (Stanford University, Stanford, CA, USA), Elisabete de Gouveia dal Pino (Universidade de São Paulo, São Paulo, Brazil), and Yihua Yan (National Astronomical Observatories, Beijing, China).