On the theory of MAG waves and a comparison with sunspot observations from CDS/SoHO D. Banerjee, E. O'Shea, M. Goossens, J. G. Doyle and S. Poedts A&A, 395 1 (2002) 263-277 Published online: 29 October 2002 DOI: 10.1051/0004-6361:20021257