Fexiixii emission lines in solar active regions observed by the RES-C spectroheliograph on the CORONAS-I mission

Theoretical line intensity ratios involving Fexii transitions in the 186-201Å wavelength range are compared with observational data for five solar active regions, obtained by the RES-C spectroheliograph on the CORONAS-I mission. Generally good agreement is found between theory and observation, hence resolving discrepancies previously found in the comparison of calculations with active region and subflare spectra from the Solar EUV Rocket Telescope and Spectrograph (SERTS). However, the Fexii 190.06- and 201.12-Å lines are blended with Fex 190.04Å and Fexiii 201.13Å, respectively. In addition, a weak feature at ~197Å, tentatively identified as Fexii 196.87Å, does not appear to be due to this ion.