ocr: SUMER The aim of the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) instrument is to obtain spectra for determination of tem- peratures, densities, and velocities in solar atmospheric features. This is to investigate small-scale reconnection events and so to help to understand how the Sun heats its corona. PRINCIPAL INVESTIGAIOR: Werner Curdt, Mox-Planck-Institut fur Aeronomie, Katlenburg-Lin- dau, Germany MPAE OTHER INSTITUTIONS INVOLVED: IAS, Institut d'Astrophysique Spatiale, Orsay GSFC, Goddard Space Flight Center, Greenbelt CSSA, Center for Space Science and Astrophysics, Sta ...