Centre-Limb Variations of Fraunhofer Line-Breadths and Intensities

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Abstract
Measurements have been made of the breadths, equivalent breadths and central intensities of twenty rather faint blue and violet Fraunhofer lines at various positions on the Sun's disk. The breadths of all fainter lines increase as one approaches the limb. The manner of this variation shows the Sun's reversing layer to be in a state of non-isotropic large-scale turbulence with a vertical velocity of 1.74 km./sec. and a horizontal velocity of 2.79 km./sec. Measurements show that the equivalent breadths of the faintest lines increase steadily from centre to limb while central intensities are approximately constant. No variation between equatorial limb and polar limb intensities or breadths could be detected.

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