Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45..125l&link_type=abstract
Astronomy and Astrophysics, vol. 45, no. 1, Dec. 1975, p. 125-134.
Astronomy and Astrophysics
Astrophysics
57
Iron, Line Spectra, Nickel, Solar Corona, Transition Probabilities, Abundance, Atomic Excitations, Emission Spectra, Ion Density (Concentration), Ion Recombination, Ionic Collisions, Metal Ions, Radiant Flux Density, Radiative Transfer, Solar Spectra, X Ray Spectra
Scientific paper
Collision strengths and radiative transition probabilities for n 3 and n 4 configurations are calculated on the basis of a 51-level atomic model and the solar Fe XVII and Ni XIX spectra in an attempt to obtain information about the physical conditions under which those spectra are emitted. Relative line intensities computed from the results are compared with recent observations and found to be in reasonable agreement. A relative Fe/Ni abundance of about 20 is determined from corona observations. It is concluded that the intensity ratios of the strongest Fe XVII lines are not sufficiently sensitive to changes in electron density and electron temperature to permit a determination of these parameters, but that the overall good agreement between observed and calculated line ratios gives confidence that the atomic processes involved in forming Fe XVII and Ni XIX are now understood.
Loulergue M.
Nussbaumer Harry
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