Solar rotation and cycle length

A positive correlation is suggested between solar rotation rate and solar c ycle length for cycles 12 to 20. This result seems to be opposite to recent observations in solar-type stars and the Sun and yields inverse correlatio ns between cycle lengths and chromospheric activity, but it agrees with pre vious work with solar-type stars and the Sun suggesting a positive correlat ion between cycle length and rotation rate. Estimates of solar cycle length for the Maunder minimum suggest a length similar to 17 yr.