An analysis of the solar rotation velocity determined tracing microwave features and an estimate of their heights

Measurements of the Sun performed at 37 GHz (8 mm) with the 14 m radio telescope of the Metsahovi Radio Observatory were analysed and rotation velocities determined tracing microwave Low brightness Temperature Regions in the years 1979-1980, 1981-1982, 1987-1988, and 1989-1991. The statistical weights method is applied and possible changes of measured rotation velocity values discussed.