Extreme-ultraviolet spectral line widths in quiet-Sun coronal plasmas at distances of 1.03 <= R circle dot <= 1.45 along the solar equatorial plane

We measure the full width at half-maximum intensity (FWHM) of extreme-ultar violet (EUV) spectral line profiles as a function of height in the Sun's eq uatorial west limb streamer region using EUV spectra recorded by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the S olar and Heliospheric Observatory (SOHO) spacecraft. The spectra were recor ded on 1996 November 21 and 22, during a special "roll" maneuver in which t he SUMER slit was oriented in the east-west direction. Because the SUMER sp ectrometer is stigmatic along the slit length, the spectra are spatially re solved in the east-west direction. The spectra we discuss cover an effectiv e distance range outside the west limb from 1.03 to 1.45 R.; the maximum sp atial resolution is 1 ". We select a group of emission lines for analysis t hat under the usual ionization equilibrium assumption have maximum fraction al abundances at temperatures ranging from 3 x 10(5) up to 2 x 10(6) K. We determine nonthermal motions as a function of position in the streamer regi on from the FWHMs under the assumption that the ion temperature equals the electron temperature of the streamer plasma. The electron temperature was d erived previously by Feldman and coworkers.