Variability of the polarization profiles of the Ba II D2 line in the solar atmosphere A. López Ariste, A. Asensio Ramos, R. Manso Sainz, M. Derouich and B. Gelly A&A, 501 2 (2009) 729-734 Published online: 19 May 2009 DOI: 10.1051/0004-6361/20078154