Computer Science – Sound
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..141...35a&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 141, no. 1, p. 35-49.
Computer Science
Sound
2
Calcium, Line Spectra, Metal Ions, Photosphere, Solar Limb, Solar Spectra, Local Thermodynamic Equilibrium, Sound Waves, Velocity Distribution
Scientific paper
We study the center-limb (CL) variation of the average profiles of four Ca I lines near 6500 A and compare these observations with synthetic data obtained from several line formation models having different thermal structure, line parameters, LTE and non-LTE conditions, and micro- and macroturbulence values, to assess the formation characteristics of our Ca I lines in the solar photosphere. Comparison of numerical results with observations indicates that non-LTE is indispensable to fit the CL variation of the central residual intensity for the line 6493 A and anisotropic microturbulence is indispensable to improve the CL behavior of the equivalent widths for all lines. The Ca I line analysis favors a cool photospheric model, but this cannot be disentangled clearly from the effects of non-LTE and small-scale velocity fields on the grounds of the present line formation models.
Ambruoso P.
Gomez M. T.
Marmolino Ciro
Severino Giuseppe
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