Finite eddy-size effects on centre-to-limb variations - an alternative to anisotropic microturbulence

Details Finite eddy-size effects on centre-to-limb variations - an alternative to anisotropic microturbulence Finite eddy-size effects on centre-to-limb variations - an alternative to anisotropic microturbulence

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....40..267f&link_type=abstract

Astronomy and Astrophysics, vol. 40, no. 3, May 1975, p. 267-276.

Astronomy and Astrophysics

Astrophysics

14

Atmospheric Turbulence, Solar Spectra, Spectral Line Width, Turbulence Effects, Velocity Distribution, Plasma Turbulence, Radiative Transfer, Solar Limb, Stochastic Processes

Scientific paper

An attempt is presented to explain the center-to-limb increase in width of solar lines on the basis of the theory of line formation in a turbulent medium where finite eddy-size is taken into account (Auvergne et al., 1973). Hydrodynamic velocities along the line of sight are represented by a step-wise constant stochastic process (Kubo-Anderson Process), with Gaussian isotropic velocity distribution and an arbitrary variation of the eddy-size with the continuum optical depth. For the simplest case of constant geometrical eddy-size, the profiles are found to be wider at the limb than at the center; this is because the optical size of the eddies decreases towards the limb, bringing us closer to the microturbulent limit. An application to the forbidden Mg I 4571 A line shows that this effect accounts for much of the observed widening, without recourse to ad-hoc assumptions such as depth variation of the microturbulent velocity or anisotropic microturbulence.

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