Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189..243s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 243-253.
Astronomy and Astrophysics
Astrophysics
36
Line Spectra, Magnetic Flux, Nonequilibrium Thermodynamics, Radiative Transfer, Solar Flux, Solar Magnetic Field, Astronomical Models, Atmospheric Models, Ionization, Iron, Solar Spectra, Spectral Line Width
Scientific paper
NLTE calculations of approximately 200 Fe I and Fe II spectral lines with a comprehensive model atom are presented for a quiet sun model and a grid of fluxtube models. These calculations are compared with LTE results and the departures from LTE in fluxtubes are estimated. For all the fluxtube models tested, the departures from LTE ionization for the Fe I lines are found to be larger than for the quiet sun. Fe II lines show almost no difference between LTE and NLTE. The influence of temperature gradients on the departures is also studied and discussed. The profiles of five Fe I and one Fe II lines are analyzed in detail and the errors in empirically determined velocities and temperatures in fluxtubes, introduced by the assumption of LTE, are estimated. It is found that assuming LTE has practically no effect on the determined velocities, but that it may lead to an overestimation of the temperature in fluxtubes at the heights at which the lines are formed.
Solanki Sami K.
Steenbock W.
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