Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..313l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 2, June 1984, p. 313-324.
Astronomy and Astrophysics
Astrophysics
53
Atomic Spectra, Resonance Lines, Solar Flares, Solar Spectra, Solar X-Rays, X Ray Spectra, Atomic Excitations, Electron Transitions, Hartree Approximation, Ionization Coefficients, Iron, Solar Temperature, Spectrum Analysis
Scientific paper
An analysis of the satellite lines of Fe XX III of the 1s - 2p transition near 1.9 A in solar flare spectra is presented. Wavelengths and intensities are obtained from a set of Dirac-Fock and Hartree-Fock equations. The collisional excitation contribution was characterized by a distorted wave formalism and the corresponding spectrum obtained with Voight line profiles describing instrumental and Doppler broadening. Three calculations for the q/w line intensity ratio are compared in terms of contributions from Fe XX III satellites. The application of the j/w and q/w ratios as diagnostics for solar plasmas is discussed. Finally, the calculated Fe X II-XXV spectra are compared with crystal spectrometer data.
Cowan Robert D.
Grant Ian P.
Hata J.
Lemen James R.
Phillips Kenneth J. H.
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