Segmentation of coronal features to understand the solar EUV and UV irradiance variability S. T. Kumara, R. Kariyappa, J. J. Zender, G. Giono, V. Delouille, L. P. Chitta, L. Damé, J.-F. Hochedez, C. Verbeeck, B. Mampaey and V. H. Doddamani A&A, 561 (2014) A9 Published online: 17 December 2013 DOI: 10.1051/0004-6361/201322137