Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....92...63c&link_type=abstract
Astronomy and Astrophysics, vol. 92, no. 1-2, Dec. 1980, p. 63-69. Research supported by the Consiglio Nazionale delle Ricerche
Astronomy and Astrophysics
Astrophysics
18
D Lines, Sodium, Solar Atmosphere, Solar Spectra, Kinetic Theory, Line Spectra, Thermodynamic Equilibrium
Scientific paper
The kinetic equilibrium of Na I in the solar atmosphere is studied for different atomic models (up to 9 bound levels). The line transfer problem is solved, in its differential form, for the complete redistribution of line photons. The intensity profiles of the visible lines are calculated at different positions on the solar disk and compared with the observed values. It is found that a satisfactory agreement with the observations can be reached, for the whole spectrum, with the HSRA and a suitable choice of the microturbulence and macroturbulence when the currently accepted values of the atomic parameters are used. The best choice of the microturbulence seems to be intermediate between those proposed by Gehren and Lites. The corresponding macroturbulence distributions, depending on angle and depth, increase outward and reach, around the temperature minimum, values larger than those commonly quoted in the literature.
Caccin Bruno
Gomez M. T.
Roberti Giuseppe
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