Benchmarking atomic data for astrophysics: a first look at the soft X-ray lines. (arXiv:1208.2142v1 [astro-ph.SR])

Benchmarking atomic data for astrophysics: a first look at the soft X-ray lines. (arXiv:1208.2142v1 [astro-ph.SR]):
A collection of the best solar and laboratory spectra in the soft X-rays is
used here to perform a preliminary benchmark in this wavelength region, by
comparing observed vs. predicted wavelengths and calibrated solar irradiances.
The benchmark focuses on the Fe IX - Fe XIV ions,for which we have recently
calculated the relevant atomic data, however a few other ions have also been
benchmarked. The iron ions are dominating the soft X-rays, however a large
fraction of the strongest soft X-ray lines due to n=4 -> n=3 transitions were
previously unidentified. The strongest transitions are all identified here, in
particular the decays from the core-excited levels (3s 3p^l 4s, l=$ 5,4,3,2,1
for Fe X, Fe XI, Fe XII, Fe XIII, and Fe XIV respectively) which are the
strongest soft X-ray transitions from these ions. Many new identifications are
proposed, some only tentatively. Good agreement in terms of solar irradiances
between the soft X-ray and EUV (n=3 -> n=3) transitions is found, confirming
the reliability of the new large-scale calculations. Some of the new atomic
data and identifications are particularly important for the Solar Dynamic
Observatory (SDO) Atmospheric Imaging Assembly (AIA) 94 A band.