Rapid non-LTE calculations of Balmer lines and hydrogen ionization - The solar case

Details Rapid non-LTE calculations of Balmer lines and hydrogen ionization - The solar case Rapid non-LTE calculations of Balmer lines and hydrogen ionization - The solar case

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..245d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 245-248.

Astronomy and Astrophysics

Astrophysics

3

Balmer Series, Hydrogen Ions, Nonequilibrium Thermodynamics, Solar Atmosphere, Solar Spectra, Approximation, H Alpha Line, Temperature Distribution

Scientific paper

The authors propose an extremely rapid approximation method to determine a model of a plane-parallel atmosphere in hydrostatic equilibrium given the temperature distribution, the gravity, and the chemical composition. The populations of the energy levels of hydrogen, the principal component, as well as its degree of ionization, are determined without the assumption of local thermodynamic equilibrium (non-LTE) by an approximation method based on the escape probability. The comparison of the results thus obtained with those of Vernazza et al. (1981) for their Model C is satisfactory for the Balmer lines and for ionization in the low chromosphere and in the photosphere.

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