The role of magnetic bald patches in surges and arch filament systems C. H. Mandrini, P. Démoulin, B. Schmieder, Y. Y. Deng and P. Rudawy A&A, 391 1 (2002) 317-329 Published online: 29 July 2002 DOI: 10.1051/0004-6361:20020745