FE-XIV LINE RATIOS IN THE SUN

Recent R-matrix calculations of electron-impact excitation rates for Fe XIV are used to derive theoretical electron density-sensitive emission-line ratios involving transitions in the wavelength range 211-274 angstrom. Electron densities deduced from the observed line ratios for solar flares and active regions, obtained with the Naval Research Laboratory's SO82A slitless spectrograph on board Skylab, are in excellent internal agreement and, furthermore, compare favorably with densities determined independently from line ratios in Fe XII and Fe XIII. These results provide experimental support for the accuracy of the atomic data adopted in the analysis, as well as for the techniques used to calculate the line ratios.