Charles Carabetian

TL;DR: The Extreme Ultraviolet Imaging Telescope (EIT) on board the SOHO spacecraft has been operational since 2 January 1996 and has been used to observe the Sun over a 45 × 45 arc min field of view in four emission line groups: Fe IX, X, Fe XIIi, Fe xv, and He II.

TL;DR: In this article, the authors present the preflight photometric calibration of the Extreme-ultraviolet Imag- ing Telescope (EIT) aboard the Solar and Heliospheric Observatory (SOHO), which consists of a Ritchey - Chretien telescope with multilayer coatings applied to four quadrants of the primary and secondary mirrors, several filters and a backside-thinned CCD detector.

TL;DR: Optical characteristics in the wavelength range 15 - 75 nm of the EUV imaging telescope to be launched soon on the SOHO mission are discussed in this article, where bandpasses and photometric sensitivity of the multilayered optics telescope have been measured by a dedicated synchrotron light source at Orsay, France

TL;DR: The CalRoc program was initiated to provide well calibrated, contemporaneous observations in support of the SOHO Extreme Ultraviolet Imaging Telescope (EIT) EIT as discussed by the authors.