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
Received 4 August 1999 / Accepted 29 September 1999
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 (1238) and C IV (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 (firstname.lastname@example.org. de)
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© European Southern Observatory (ESO) 1999
Online publication: November 23, 1999