The solar radius in the EUV during the cycle XXIII C. G. Giménez de Castro, A. C. Varela Saraiva, J. E. R. Costa and C. L. Selhorst A&A, 476 1 (2007) 369-372 Published online: 23 October 2007 DOI: 10.1051/0004-6361:20078118