Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....64...91w&link_type=abstract
Astronomy and Astrophysics, vol. 64, no. 1-2, Mar. 1978, p. 91-95.
Astronomy and Astrophysics
Astrophysics
3
Asymmetry, Brightness Temperature, Solar Temperature, Data Reduction, Electrophotometry, Solar Limb, Temperature Distribution, Von Zeipel Method
Scientific paper
Photoelectric measurements in July 1976 of the continuum center-to-limb variation of the quiet sun along polar and equatorial diameters have detected a north-south asymmetry in solar brightness. The cause and duration of the asymmetry are unknown. The south polar region was 19 K warmer (at an optical depth of 0.15) and the north polar region was 19 K cooler than average, although the equatorial brightness distribution did not depart significantly from the average. The observed intensities were corrected for scattered light, image blurring, and differential extinction, and radiative transfer calculations were used to interpret the measurements. The measurements were more in accord with the HSRA temperature distribution than with the Holweger-Mueller model.
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