Abstract
The method of computer controlled photoelectric drift scans has been improved by virtue of a new timing technique, allowing for an accuracy of 4 ms or equivalently 50 km on the Sun. With this technique, our previous result for the solar semidiameter has been confirmed: R = 960.277″. The extreme solar limb intensity profile at 5012 A has been derived from drift scans. A comparison with the computed profile has been made, and parameters for the base of the chromosphere have been derived.
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