A CORONAL SPECTRUM IN THE 500-1610 ANGSTROM WAVELENGTH RANGE RECORDEDAT A HEIGHT OF 21,000 KILOMETERS ABOVE THE WEST SOLAR LIMB BY THE SUMER INSTRUMENT ON SOLAR AND HELIOSPHERIC OBSERVATORY

We present a solar coronal spectrum recorded by the extreme UV spectro meter SUMER on the Solar and Heliospheric Observatory. The spectrum wa s taken between 21:28 UT on 1996 June 25 and 02:47 UT on 1996 June 26, at a height of 21,000 km above the west equatorial limb with the slit oriented in the north-south direction. At the time of the observation s the Sun was rather quiet, and the west limb appeared ''devoid of any activity.'' The spectrum, which covers the 500-1610 Angstrom waveleng th range, originates from plasmas with temperatures ranging between 1. 5 x 10(4) and 1.5 x 10(6) K. Identification of lines originating from different temperature regimes is facilitated by the appearance of thei r intensity along the 300'' long slit. Well over 800 lines have been f ound, many of which were not previously observed. We present the entir e spectrum and discuss line identifications. A table of the wavelength s of lines observed, with their identifications and peak intensities, is provided. Although we have identified fines previously detected in laboratory plasmas and a number of new lines not previously observed, over 40% of the SUMER lines remain unidentified. Among the newly detec ted lines, some have a potential as plasma density diagnostics.