Abstract
The radial brightness distribution of the quiet Sun at 8.6 mm is synthesized from observations using a sixteen element east-west interferometer in Nagoya. The observed brightness is flat from the disk center to 0.8R ⊙. A slight darkening appeared between 0.8R ⊙ and the limb. No evidence of the bright ring near the limb is found. The radio radius at 8.6 mm is 1.015±0.005R ⊙. In addition there exists a coronal component just outside the radio limb.
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Kawabata, K., Fujishita, M., Kato, T. et al. Solar brightness distribution at 8.6 mm from interferometer observations. Sol Phys 65, 221–227 (1980). https://doi.org/10.1007/BF00152790
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DOI: https://doi.org/10.1007/BF00152790