I. Kink et al., New identifications of Si VIII and S x lines in the solar coronal spectrummeasured by SOHO/SUMER, ASTROPHYS J, 512(1), 1999, pp. 496-499
This paper reports the identification of 14 lines in the solar coronal spec
trum as high-excitation 2s(2)2p(2)3s-2s(2)2p(2)3p and 2s(2)2p(2)3p-2s(2)2p(
2)3d transitions in Si VIII and S x (N I isoelectronic sequence). The analy
sis combines solar spectra, recorded by the SUMER (Solar Ultraviolet Measur
ement of Emitted Radiation) instrument on board the Solar and Heliospheric
Observatory (SOHO) satellite, with laboratory data obtained with the beam-f
oil technique. Theoretical gA values and branching ratios for the observed
lines, based on semiempirical calculations, are also presented. Intensity r
atios between the newly identified high-excitation transitions and known fo
rbidden transitions within the 2s(2)2p(3) ground configuration can be used
in determining coronal plasma temperatures in the 70-120 eV range.