Abstract
Center to limb variation of the excess brightness of photospheric facular granules was observed at 530 nm with a balloon-borne telescope of 10 cm aperture. Facular granules are found to be 9.2% and 16.2% brighter than the adjacent quiet region at cos θ = 0.65 and 0.50 respectively, θ being the angle between the Sun's normal and the line of sight. This observation, together with our earlier result (Hirayama, 1978), leads to facular models which are 600 K hotter than the photosphere if the diameter of facular granules is assumed to be 600 km, and 1000 K hotter if 150 km is assumed instead. It was also found that the soft X-ray bright points as observed with the Skylab do not correspond spatially to the photospheric facular granules near the polar region.
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Hirayama, T., Moriyama, F. Center to limb variation of the intensity of the photospheric faculae. Sol Phys 63, 251–255 (1979). https://doi.org/10.1007/BF00174531
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DOI: https://doi.org/10.1007/BF00174531