THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 91:461-482, 1994 March

       EXTREME ULTRAVIOLET SPECTRUM OF A SOLAR ACTIVE REGION FROM SERTS
 
                     ROGER J. THOMAS AND WERNER M. NEUPERT
   Laboratory for Astronomy and Solar Physics, Code 680, NASA-Goddard Space
                      Flight Center, Greenbelt, MD 20771
 
                                   ABSTRACT

        We present wavelengths and absolute intensities for 269 emission
     lines from a single active region observed by the Solar EUV Rocket
     Telescope and Spectrograph (SERTS) on 1989 May 5.  For this catalog,
     the imaged spectra have been spatially averaged over a field of view
     7"x276" cutting through the center of AR5464 at S18 W45.  Wavelength
     coverage is 170-450 A with a spectral resolution approaching 10,000.
     Most of the line positions are determined to 5 mA or better,
     representing the highest accuracy yet obtained for solar wavelengths
     throughout this spectral interval.  The relative photometric
     calibration of the instrument is good to +/-20% over its first-order
     range, and has been placed onto an absolute scale that should be
     correct to within a factor less than 2.  Where known, identifications,
     atomic transitions and formation temperatures are also given.  The
     identified lines arise from temperatures that cover the range 4.7 <=
     log T <= 6.8, providing information about the Sun's corona and upper
     transition region.  Upper limits to the intensity of any emission line
     not included here can be estimated from the measured instrumental
     sensitivity.  This averaged EUV spectrum should prove useful as a
     source of accurate wavelengths and intensities for emission
     characteristic of the high-temperature plasma associated with a solar
     active region and small subflare.

     Subject headings:  Sun: activity -- Sun: UV radiation