Multispectral imaging the sun in the ultraviolet

Solar images in the ultraviolet (UV) are the key to the understanding of the highly dynamic and energetic solar atmosphere. Nowadays, several missions provide simultaneous observations in multiple wavelengths. Such multispectral images have traditionally been used as inputs to physical models. However, as the number of wavelengths steadily increases, empirical approaches such as hyperspectral analysis and blind source separation, become of interest. Two examples are presented, based respectively on spatial and on spectral mixtures of UV data.