The Hα surges and EUV jets from magnetic flux emergences and cancellations Y. C. Jiang, H. D. Chen, K. J. Li, Y. D. Shen and L. H. Yang A&A, 469 1 (2007) 331-337 Published online: 24 April 2007 DOI: 10.1051/0004-6361:20053954