On the properties of faculae at the poles of the Sun J. Blanco Rodríguez, O. V. Okunev, K. G. Puschmann, F. Kneer and B. Sánchez-Andrade Nuño A&A, 474 1 (2007) 251-259 Published online: 28 August 2007 DOI: 10.1051/0004-6361:20077739