Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..333c&link_type=abstract
Astronomy and Astrophysics, v.320, p.333-341
Astronomy and Astrophysics
Astrophysics
9
Atomic Data, Sun: Corona, Sun: Uv, Stars: Coronae, Ultraviolet: Stars
Scientific paper
The ion Fe XVI is abundant in solar active regions and flares. Strong spectral lines from this ion have been observed over a wide wavelength range. The transitions 3s-3p and 3p-3d fall between 250 and 365Å and lines from transitions between n=3 to n=4, n=3 to n=5 fall between 30 and 80Å. In this paper, we present distorted wave results for the electron scattering collision strengths from the ground level to all the other levels and discuss previous calculations. We compare our theoretical intensity ratios with solar observations and show that the strongest spectral lines in the X-ray wavelength range do not correspond to the dipole transitions, 3s-4p, 3s-5p, as might be expected. We comment on the approximations which have been generally used in synthetic spectrum programs to simulate the Fe XVI spectral line intensities and the consequences for analyses of solar and stellar spectra.
Blancard Christophe
Brown Aaron W.
Cornille Marguerite
Dubau Jacques
Mason Harris E.
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