Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152..417b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 2, Nov. 1985, p. 417-426. SERC-Navy-supported research.
Astronomy and Astrophysics
Astrophysics
22
Astronomical Spectroscopy, Calcium, Line Spectra, Resonance Lines, Solar Flares, Atomic Spectra, Lyman Alpha Radiation, Time Response
Scientific paper
New calculations have been carried out for the wavelengths and intensities of the Ca xx 1 s-2p Ly α transitions and for the associated 1 snl-2pnl (n = 2-5) dielectronic satellites in Ca XIX. The Ly α intensities are derived from a collisional radiative model which accounts for direct excitation, electron and protons collisional transfer from 2s, radiative cascade, radiative recombination and for the low intensity Ly α component, contribution from the blended 1 s-2s M1 transition. The direct excitation rates have been estimated in the D.W. approximation and the radiative recombination rates from the photoionization cross-sections of Burgess (1958). The satellite lines have been calculated using the scaled Thomas-Fermi model developed earlier for magnesium and iron. In order to study the screening effect of the perturbing nl electron, calculations based on a simple hydrogenic potential have also been carried out. The theoretical spectra have been synthesized from the atomic data and compared with P78 flare spectra using a line fitting procedure. The theoretical spectra are in good agreement with the observations for the satellite intensities as well as for the high intensity Ly α component. However the present theory underestimates the low intensity component by 10-15 % for typical flare concitions.
Blanchet Luc
Cornille Marguerite
Dubau Jacques
Faucher P.
Lion J.
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