Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...512..496k&link_type=abstract
The Astrophysical Journal, Volume 512, Issue 1, pp. 496-499.
Astronomy and Astrophysics
Astronomy
15
Atomic Data, Sun: Corona
Scientific paper
This paper reports the identification of 14 lines in the solar coronal spectrum as high-excitation 2s^22p^23s-2s^22p^23p and 2s^22p^23p-2s^22p^23d transitions in Si VIII and S X (N I isoelectronic sequence). The analysis combines solar spectra, recorded by the SUMER (Solar Ultraviolet Measurement of Emitted Radiation) instrument on board the Solar and Heliospheric Observatory (SOHO) satellite, with laboratory data obtained with the beam-foil technique. Theoretical gA values and branching ratios for the observed lines, based on semiempirical calculations, are also presented. Intensity ratios between the newly identified high-excitation transitions and known forbidden transitions within the 2s^22p^3 ground configuration can be used in determining coronal plasma temperatures in the 70-120 eV range.
Engström Lars
Feldman Uri
Kink Ilmar
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