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Astron. Astrophys. 352, 321-326 (1999)


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The solar ultraviolet spectrum from 1200 Å to 1560 Å: a radiometric comparison between SUMER/SOHO and SOLSTICE/UARS

K. Wilhelm 1, T.N. Woods 2, U. Schühle 1, W. Curdt 1, P. Lemaire 3 and G.J. Rottman 2

1 Max-Planck-Institut für Aeronomie, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany
2 Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309-0590, USA
3 Institut d'Astrophysique Spatiale, Unité Mixte, CNRS-Université Paris XI, Bat. 121, 91405 Orsay, France

Received 4 August 1999 / Accepted 29 September 1999

Abstract

After short descriptions of the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) spectrometer onboard SOHO (the Solar and Heliospheric Observatory) and the SOLSTICE (Solar-Stellar Irradiance Comparison Experiment) spectrometer on UARS (the Upper Atmosphere Research Satellite), a radiometric comparison is carried out of solar irradiance spectra measured by SOLSTICE and spectra derived from SUMER radiance observations of quiet-Sun regions in the wavelength range from 1200 Å to 1560 Å. The emission lines N V ([FORMULA]1238) and C IV ([FORMULA]1548) are considered in detail. For these lines, irradiance data are also available from full-Sun raster scans of SUMER and deviations of less than 15% are found between SOLSTICE and SUMER results - well within the combined uncertainty margins.

Key words: Sun: UV radiation – Sun: transition region – instrumentation: spectrographs

Send offprint requests to: K. Wilhelm (wilhelm@linmpi.mpg. de)

© European Southern Observatory (ESO) 1999

Online publication: November 23, 1999

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