FIRST RESULTS FROM THE SOHO ULTRAVIOLET CORONAGRAPH SPECTROMETER

The SOHO Ultraviolet Coronagraph Spectrometer (UVCS/SOHO) is being use d to observe the extended solar corona from 1.25 to 10 R-. from Sun ce nter. Initial observations of polar coronal holes and equatorial strea mers are described. The observations include measurements of spectral line profiles for H I L alpha and L beta O VI 1032 Angstrom and 1037 A ngstrom, Mg x 625 Angstrom, Fe XII 1242 Angstrom and several others. I ntensities for Mg x 610 Angstrom Si XII 499 Angstrom, and 520 Angstrom , S x 1196 Angstrom, and 22 others have been observed. Preliminary res ults for derived H-0, O5+,Mg9+, and Fe11+ velocity distributions and i nitial indications of outflow velocities for O5+ are described. In str eamers, the H-0 velocity distribution along the line of sight (specifi ed by the value at e(-1), along the line of sight) decreases from a ma ximum value of about 180 km s(-1) at 2 R-.. In polar coronal holes, th e O5+ increases with height reaching a value of 150 km s(-1) at 4.7 R- .. In polar coronal holes, the O5+ velocity at e(-1) is about equal to that of H-0 at 1.7 R-. and significantly larger at 2.1 R-.. The O5+ i n both streamers and coronal holes were found to have anisotropic velo city distributions with the smaller values in the radial direction.