Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....34..375g&link_type=abstract
Astronomy and Astrophysics, vol. 34, no. 3, Sept. 1974, p. 375-386. In French.
Astronomy and Astrophysics
Astrophysics
4
Limb Darkening, Line Spectra, Magnesium, Solar Spectra, Spectrum Analysis, Absorption Spectra, Chromosphere, Doppler Effect, Photosphere, Radiant Flux Density, Resonance, Solar Limb, Spectral Line Width
Scientific paper
Center-to-limb variations of Mg II resonance line profiles, deduced from balloon spectra of the sun, are studied. Limb-darkening in the line wings agrees satisfactorily with frequency-indpendent source functions and Voigt profiles for line absorption coefficients. Estimates of Doppler widths from a line core analysis show a rapid increase of turbulence velocities with height. The source functions of the two lines are found to be unequal at the same geometrical depth, which suggests that collisional coupling between fine-structure levels (3p) is weak. Apparent source function variations with frequency are found in the spectral interval from 0.2 to 0.5 A from line center. Several possible explanations of this fact (partially conherent scattering, geometrical and dynamical effects) are discussed.
Gouttebroze Pierre
Lemaire Philippe
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