Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..426b&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 6, July 1980, p. 426-431.) Soviet Astronomy Letters, vol. 6, July-Aug. 1980, p. 236-238
Astronomy and Astrophysics
Astronomy
Brightness Temperature, Centimeter Waves, Radio Astronomy, Solar Flux Density, Solar Radio Emission, Chromosphere, Radio Telescopes, Solar Corona
Scientific paper
Observations of the sun with the RATAN-600 radio telescope at five wavelengths (2.0-4.0 cm) and with resolution ranging from 17 arcsec x 13 arcmin to 33 arcsec x 25 arcmin indicate that the brightness temperature Tb is distributed uniformly over the disk out to 0.95 solar mass. At 4.0 cm there is a limb brightening effect of equal to or less than 10%, weakening toward shorter wavelengths. The value of Tb drops to one-half at a radius ranging from 1.024 solar mass (wavelength 2.0 cm) to 1.052 solar mass (wavelength 4.0 cm); Tb = 400 K, 1500 K, respectively, at 1.1 solar mass. This behavior indicates that the structure of the chromosphere-corona transition zone and the inner corona is decidedly inhomogeneous.
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