The ability of current micro-velocity models to represent center-limb line profiles

Details The ability of current micro-velocity models to represent center-limb line profiles The ability of current micro-velocity models to represent center-limb line profiles

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45...41e&link_type=abstract

Solar Physics, vol. 45, Nov. 1975, p. 41-58.

Physics

18

Astronomical Models, Atmospheric Turbulence, Solar Limb, Thermodynamic Equilibrium, Graphs (Charts), Line Spectra, Solar Spectra, Tables (Data)

Scientific paper

Results are presented on the ability of microturbulence, LTE line formation, and a homogeneous thermal model to represent realistically the center-limb variation of temporally and spatially averaged solar-line profiles. Three somewhat similar semiempirical thermal models are used in combination with five current microturbulence models which cover the gamut from homogeneous-isotropic to nonhomogeneous-anisotropic. From high-resolution photoelectric data for the lines between 5000 and 6000 A at five limb positions, 17 Fe I and 5 Fe II line profiles are selected for study. An iterative scheme has been developed to calculate theoretical profiles for the various combinations of models and to compare them with the observed profiles using the abundance at each limb position and the magnitude of the pressure broadening at the center of the disk as parameters. It is found that a microturbulence model, for which the radial and tangential components increase into deeper layers, produces a reasonable center-limb fit for lines less than 100 mA. However, for lines stronger than 140 mA, microturbulence models with no depth dependence produce the best match between theory and observation. Thus, there is reason to question the uniqueness of the microturbulence concept.

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