Solar Physics

, Volume 195, Issue 1, pp 13–44 | Cite as

The Preflight Photometric Calibration of the Extreme-Ultraviolet Imaging Telescope EIT

  • K.P. Dere
  • J.D. Moses
  • J.-P. Delaboudinière
  • J. Brunaud
  • C. Carabetian
  • J.-F. Hochedez
  • X.Y. Song
  • R.C. Catura
  • F. Clette
  • J.-M. Defise
Article

Abstract

This paper presents the preflight photometric calibration of the Extreme-ultraviolet Imaging Telescope (EIT) aboard the Solar and Heliospheric Observatory (SOHO). The EIT consists of a Ritchey–Chrétien telescope with multilayer coatings applied to four quadrants of the primary and secondary mirrors, several filters and a backside-thinned CCD detector. The quadrants of the EIT optics were used to observe the Sun in 4 wavelength bands that peak near 171, 195, 284, and 304 Å. Before the launch of SOHO, the EIT mirror reflectivities, the filter transmissivities and the CCD quantum efficiency were measured and these values are described here. The instrumental throughput in terms of an effective area is presented for each of the various mirror quadrant and filter wheel combinations. The response to a coronal plasma as a function of temperature is also determined and the expected count rates are compared to the count rates observed in a coronal hole, the quiet Sun and an active region.

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • K.P. Dere
    • 1
  • J.D. Moses
    • 1
  • J.-P. Delaboudinière
    • 2
  • J. Brunaud
    • 2
  • C. Carabetian
    • 2
  • J.-F. Hochedez
    • 2
  • X.Y. Song
    • 2
  • R.C. Catura
    • 3
  • F. Clette
    • 4
  • J.-M. Defise
    • 5
  1. 1.E.O. Hulburt Center for Space ResearchNaval Research LaboratoryWashington U.S.A.
  2. 2.Institut d'Astrophysique SpatialeUniversité Paris XIOrsay CedexFrance
  3. 3.Lockheed Martin Palo Alto Research LaboratoryPalo Alto, U.S.A.
  4. 4.Observatoire Royal de BelgiqueBrussels, Belgium
  5. 5.Centre Spatial de LiègeAngleur, Belgium

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