Solar limb brightening and enhancement measurements at 1.2 mm

Solar intensity measurements at a mean wavelength of 1.2 mm were made using a 1.6 m Cassegrain telescope. The measurements included a series of scans made during the partial solar eclipse of May 20th, 1966.A high degree of solar limb brightening is inferred from the measured intensity distribution. The ratio of the disk-averaged brightness temperature to the central brightness temperature at 1.2 mm is calculated to be 1.11 ± 0.02.A fairly intense solar outburst, of approximate duration 50 min, was observed towards the end of the eclipse.