Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..994f&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 994-1003.
Astronomy and Astrophysics
Astrophysics
17
Emission Spectra, Helium Ions, Ionization Cross Sections, Line Spectra, Plasma Spectra, Solar Corona, Electron Density (Concentration), Electron Energy, Ion Recombination, Oxygen Ions, Plasma Density, Plasma Equilibrium, Plasma Temperature
Scientific paper
It has been pointed out by Fujimoto (1979) that the ionization ratio (ratio of hydrogen-like to helium-like ion densities in the considered problem) is one of the most fundamental parameters in determining the line intensities, as well as the electron density and electron temperature of the plasma. A quasi-steady-state analysis of the observed helium-like line intensities in the one-temperature model is conducted. It is found that the line-intensity ratio is useful to estimate the electron density or to test the reliability of an observation. For the excitation cross section, the most reasonable value is given by distorted-wave calculations. Many of the coronal plasmas are interpreted as equilibrium plasmas, while some are recombining.
Fujimoto Tadashi
Kato Taichi
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