Abstract
We have made absolute measurements at Kitt Peak of the dependence of solar rotation rate upon latitude during the period 17–20 June 1977. We observed the solar potassium line at 7699 A using an atomic-beam resonance scattering apparatus. The measured sidereal equatorial rotation rate is 13.5±0.5 deg day−1. Our results are in agreement with those of Howard and Harvey from 1966–68. We intend to use this technique in a long-term program at Oberlin to monitor the equatorial rotation rate.
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