Abstract
In this work, we study Fe VIII lines emitted in the 1000-1200 A wavelength range that originate from levels that also emit transitions observed in the 190-200 A wavelength range. The intensity ratios between such lines depend on atomic physics parameters only and not on the physical parameters of the emitting plasma: they are excellent tools to verify the relative intensity calibration of instruments operating in those wavelength ranges. We first carry out extensive atomic physics calculations to improve the accuracy of the predicted intensity ratios of those lines. We then compare the results with simultaneous Hinode/Extreme Ultraviolet Imaging Spectrometer and SOHO/SUMER observations of an off-disk quiet-Sun region, identify four new lines in the 1000-1200 A range, and discuss their use for instrument calibration purposes.
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