The solar limb darkening function at 5012 A and its possible variations

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Electrophotometry, Limb Darkening, Photosphere, Solar Limb, Data Reduction, Solar Spectra, Solar Temperature, Temperature Distribution

Scientific paper

New photoelectric measurements of the solar center-to-limb variation (CLV) in the continuum at 5011.5 A have been performed to verify the brightness asymmetry reported by Wittman (1978). The N-S asymmetry found in the 1976 data also appears in the 1977 data. In addition, an E-W asymmetry of about the same magnitude is observed whose existence with time implies a low probability for a solar origin of both asymmetries. From a total of 2304 CLV scans, the average CLV, including the limb intensity profile, has been determined with considerable accuracy.

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