Improved effective rate coefficients for MG XI and CA XIX

Details Improved effective rate coefficients for MG XI and CA XIX Improved effective rate coefficients for MG XI and CA XIX

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..152f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 152-154.

Astronomy and Astrophysics

Astrophysics

7

Atomic Excitations, Recombination Coefficient, Solar Spectra, Solar X-Rays, X Ray Spectra, Atomic Collisions, Autoionization, Calcium, Forbidden Bands, Magnesium, Resonance Lines, Solar Corona

Scientific paper

Improved effective excitation and recombination rate coefficients are presented for the resonance, intercombination and forbidden lines of Mg XI and Ca XIX. The new effective excitation rates have been computed with improved direct excitation rates including the effect of autoionizing resonances on the forbidden line. The effective recombination rates have been improved by including corrected dielectronic recombination coefficients. (Such lines for helium-like ions are usually observed in the soft X-ray spectra of hot, low-density plasmas such as those found in the solar corona and in fusion devices; they are a useful source of diagnostics.) The new results lead to a better agreement in the fitting of a MacMath 11621 active region Mg XI spectrum taken on November 30, 1961 at 05.29 UT.

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