The SUMER spectrometer on SOHO images the Sun by ultraviolet light emitted by sulphur ions at a wavelength of 933 ≈. (right)
This graph is an 'atlas' of the Sun's ultraviolet emission from 800 to 1,500 ≈ as registered by SUMER. Many of the emission lines below 1,200 ≈ were unknown before SOHO.