Recalibration of the Soft X-Ray Telescope Onboard Yohkoh

• Published in: Solar physics Vol. 293; no. 10; pp. 1 - 8
• Main Author: Acton, Loren W.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-10-2018; Springer Nature B.V
• Subjects: Astrophysics and Astroparticles; Atmospheric Sciences; Construction materials; Emission measurements; Entrances; Filters; Irradiance; Physics; Physics and Astronomy; Soft x rays; Solar physics; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Spectral sensitivity; X ray spectra; X ray telescopes; Corona, temperature; Solar irradiance; Instrumental effects; Sun, X-rays
• ISSN: 0038-0938; 1573-093X
• DOI: 10.1007/s11207-018-1361-y

We present a new derivation of the X-ray spectral sensitivity of the
Soft X-ray Telescope
(SXT) experiment onboard
Yohkoh
. The recalibration is based upon the hypothesis that, during the first 15 months of the mission, an absorbing material gradually built up on the entrance filters of the telescope. We have also re-evaluated the times and sizes of ruptures of the SXT entrance filters. The impact of this recalibration on derived filter-ratio temperature, emission measure, and calculated spectral irradiance is substantial, especially for SXT data prior to November 1992.