New identifications of Fe XVII spectral lines in solar flares

Abstract

We review the identifications of Fe XVII transitions between the $$2s^22p^53s,3p$$, and 3d configurations recently published by Jupén. Our review is based on examining spectroheliograms of solar flares obtained by a Naval Research Laboratory instrument on Skylab (S082-A). We agree with the majority of identifications given by Jupén, but find different wavelengths for a few of the lines. The relative intensities of the lines are qualitatively in agreement with calculations. We also identify a broad line at 1153.20 Å with the $$2p^53s\enspace^3P_0\rightarrow 2p^5\enspace 3s\enspace ^3P_1$$ forbidden transition of Fe XVII. This line was found in flare spectra obtained by the NRL slit spectrograph on Skylab (S082-B).