ULTRAVIOLET SPECTROSCOPY OF THE EXTENDED SOLAR CORONA DURING THE SPARTAN-201 MISSION

The instruments on the Spartan 201 spacecraft are an Ultraviolet Coron al Spectrometer and a White Light Coronagraph. Spartan 201 was deploye d by the Space Shuttle on 11 April 1993 and observed the extended sola r corona for about 40 hours. The Ultraviolet Coronal Spectrometer meas ured the intensity and spectral line profile of HI Lyalpha and the int ensities of OVI 103.2 and 103.7 nm. Observations were made at heliocen tric heights between 1.39 and 3.5 R(.). Four coronal targets were obse rved, a helmet streamer at heliographic position angle 135-degrees, th e north and south polar coronal holes, and an active region above the west limb. Measurements of the HI Lyalpha geocorona and the solar irra diance were also made. The instrument performed as expected. Strayligh t suppression, spectral focus, radiometric sensitivity and background levels all appear to be satisfactory. The uv observations are aimed at determining proton temperatures and outflow velocities of hydrogen, p rotons and oxygen ions. Preliminary results from the north polar coron al hole observations are discussed.