Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..501g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 501-510.
Astronomy and Astrophysics
Astrophysics
10
K Lines, Local Thermodynamic Equilibrium, Nonequilibrium Thermodynamics, Photosphere, Solar Atmosphere, Solar Spectra, Radiative Transfer, Resonance Lines, Solar Granulation, Solar Oscillations
Scientific paper
Earlier analyses of the K I 769.9 nm resonance line are extended as a diagnostic of dynamical phenomena in the solar photosphere by evaluating the effects of dynamical variations on departures from LTE in the K I spectrum. Representative models for the solar granulation and the solar five-minute oscillation are used to estimate dynamical NLTE departures in the K I populations and to compare these to standarad plane-parallel NLTE modeling. Various NLTE mechanisms operate together in K I simultaneously with fortuitous cancellations; the resulting population departures vary less than 30 percent between dynamical perturbations. These results validate the assumption of departure invariance, i.e., adopting NLTE population departure coefficients from a standard static model for use in dynamical perturbations, as a good first-order approximation in K I 769.9 nm formation studies.
Gomez M. T.
Rutten Robert J.
Severino Giuseppe
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