Abstract
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.
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Newstead, R.A. Solar limb brightening and enhancement measurements at 1.2 mm. Sol Phys 6, 56–66 (1969). https://doi.org/10.1007/BF00146795
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DOI: https://doi.org/10.1007/BF00146795