SUMER Solar ultraviolet measurements of emitted radiation

Abstract

The experiment Solar Ultraviolet Measurements of Emitted Radiation (SUMER) is designed for the investigations of plasma flow characteristics, turbulence and wave motions, plasma densities and temperatures, structures and events associated with solar magnetic activity in the chromosphere, the transition zone and the corona. Specifically, SUMER will measure profiles and intensities of extreme ultraviolet (EUV) lines emitted in the solar atmosphere ranging from the upper chromosphere to the lower corona; determine line broadenings, spectral positions and Doppler shifts with high accuracy; provide stigmatic images of selected areas of the Sun in the EUV with high spatial, temporal and spectral resolution aJld obtain full images of the Sun and the inner corona in selectable EUV lines, corresponding to a temperature range from 104 to 2 x 106 K. SUMER will be flown on the ESA/NASA spacecraft Solar and Heliospheric Observatory (SOttO) to be launched in September 1995. SOttO will be positioned near the first Lagrangean point (L1) of the Sun-Earth system.