EUV spectroscopy for Solar Orbiter

Building on the success of EUV/UV spectroscopic studies from the SOHO mission in particular, a next generation spectroscopic study of the Sun is included in plans for Solar Orbiter. The combination of close-up and out of ecliptic observation provides unique possibilities for solar plasma diagnostics and these are outlined here. Technical challenges and the instrumental requirements for such an instrument aboard Orbiter are described in detail.