Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..517f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, Aug. 1981, p. 517-526. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
7
Plasma Equilibrium, Plasma Spectra, Solar Flares, Solar X-Rays, X Ray Spectra, Abundance, Dense Plasmas, Extreme Ultraviolet Radiation, Iron, Plasma Temperature, Ultraviolet Spectra
Scientific paper
Several sets of ionization equilibrium calculations exist for use in interpreting X-ray and EUV spectra of astrophysical plasmas. In particular, the calculations of Jordan (1969, 1970), Jacobs et al. (1977, 1978) and Summers (1974) are well known. The temperatures of maximum fractional abundance calculated by Summers for the more highly ionized and heavier elements such as iron are about a factor of two higher than the temperatures calculated by Jordan and Jacobs et al. By the use of recently obtained X-ray spectra of solar flares, it is shown that the temperatures calculated by Summers (1974) for iron are incorrect. The temperatures calculated by Jordan or Jacobs et al. should be used until further improvements become available.
Cowan Robert D.
Doschek George A.
Feldman Uri
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