Discrepancies between calculated and observed Fe XVII and NI XIX solar coronal lines

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Iron, Nickel, Solar Corona, Solar Spectra, Atomic Energy Levels, Electron Density (Concentration), Line Spectra

Scientific paper

The 36-level model atom Fe(16+) of Loulergue and Nussbaumer (1973) is extended to a 51-level atom including the n 4 configuration. The earlier conclusion still holds that relative intensities among the Fe XV I lines are not sufficiently sensitive to variations in electron density and electron temperature to deduce these parameters from observed intensity ratios. Discrepancies between calculated and observed relative intensities in Fe XVII and Ni XIX are attributed to blends or misidentifications.

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