SNOE Soft X-ray Photometry (SXP)
Judge et al. 2003, "An Estimate of the Sun's ROSAT-PSPC X-Ray Luminosities Using SNOE-SXP Measurements"
GOES
GOES NGDC NOAA archive
Yohkoh Soft X-ray Telescope (SXT; 1-2 keV)
Yohkoh Solar Observatory
Yohkoh Archive
Introduction to the Analysis of Yohkoh Data