The 22 May 2007 B-class flare: new insights from Hinode observations G. Del Zanna, U. Mitra-Kraev, S. J. Bradshaw, H. E. Mason and A. Asai A&A, 526 (2011) A1 Published online: 13 December 2010 DOI: 10.1051/0004-6361/201014906