Abstract
Observations of the Sun were made at 3 mm wavelength during the total eclipse of 1976 October 23. Analysis of the record obtained near third contact indicates that the Sun at this wavelength is slightly limb-brightened, and that the solar radius is 1.007 times the photospheric radius.
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Labrum, N.R., Archer, J.W. & Smith, C.J. Solar brightness distribution at 3mm wavelength from observations of the eclipse of 1976 October 23. Sol Phys 59, 331–343 (1978). https://doi.org/10.1007/BF00951837
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DOI: https://doi.org/10.1007/BF00951837