Solar Intensity and Limb Darkening between 8. 6 and 13

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Abstract
The intensities of the centre of the solar disk at 8.63 µ and 12.02 µ have been measured by a technique previously described for 11.10 µ. The emission temperatures obtained were 5160 °K at 8.63 µ. and 5050 °K at 12.02 µ, against the earlier value of 5036 °K at 11.10 µ. The results are a few per cent greater than values calculated from model solar atmospheres. Limb darkening measurements have been made out to 0.91 of the solar radius (solar image diameter 17 mm) at 8.63, 11.10, 12.02 and 12.95 µ, and are in good agreement with those of Pierce et al. at 8.3 and 10.2 µ. The combined measurements of solar intensity and limb darkening have been used to study the wavelength variation of the photospheric opacity. The results show less variation with wavelength than predicted theoretically. They also indicate that the free–free component of H− opacity calculated by Chandrasekhar and Breen is 40 per cent too high, which is approximately in agreement with the recent calculations of T. Ohmura and H. Ohmura.

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