Abstract
We report observations of the solar radio radius at wavelengths between 1.2 and 11 cm performed with the Bonn 100 m-telescope. In combination with former measurements of the centre-to-limb variation of the solar brightness these observations are discussed in terms of atmospheric models. We consider the solar disk to be covered by arches at low latitudes, while at the poles coronal holes are located. The temperature dependence on height is taken from EUV-line intensities, hydrostatic equilibrium is adopted, spicules are assumed to be responsible for the relatively low brightening. The interpretation of our measurements demands certain values of the brightness temperature of spicules as a function of wavelength within a modest interval.
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Fürst, E., Hirth, W. & Lantos, P. The radius of the Sun at centimeter waves and the brightness distribution across the disk. Sol Phys 63, 257–270 (1979). https://doi.org/10.1007/BF00174532
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DOI: https://doi.org/10.1007/BF00174532