Limb Darkening and Solar Rotation

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Abstract
In fuiding the darkening to the limb the determination of µ , the position on the disk, must be no less accurate than that of I ( ο, µ ), the surface brightness. Both requirements are met by photographic spectrophotometry and with this method new measures are made of limb darkening along east–west and north–south radii (Table V). From these measures photospheric models are computed for heliographic latitudes 0° and 75° (Table IX). The horizontal temperature-gradient between these latitudes produces a heliostrophic wind blowing from apparent west to east. A comparison with measures of photospheric velocity (Table X) suggests that the hydrogen convection zone is in uniform rotation and that the polar retardation of the Sun's rotation is due to a purely photospheric circulation driven by polar heating.

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