The radius of the sun at centimeter waves and the brightness distribution across the disk

Details The radius of the sun at centimeter waves and the brightness distribution across the disk The radius of the sun at centimeter waves and the brightness distribution across the disk

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63..257f&link_type=abstract

Solar Physics, vol. 63, Sept. 1979, p. 257-270. Research supported by the Centre National de la Recherche Scientifique; Deutsche

Physics

8

Astrometry, Brightness Temperature, Radii, Solar Radio Emission, Atmospheric Models, Coronal Holes, Far Ultraviolet Radiation, Solar Limb, Spicules, Temperature Dependence

Scientific paper

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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