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Towards a unified definition of solar limb during central eclipses and daily transits

The diameter of the Sun has been measured using Baily's beads during central eclipses, observed with portable telescopes. A blend of tiny emission lines produced in the first several hundred kilometers above the photosphere gives a light signal which prolonges the light curves of the beads. The simple criterion of light OFF/ON adopted in the previous approaches to define the timing of photosphere's disappearance/reappearance is modified. The technique of the limb darkening function reconstruction from the Baily's beads light curves is introduced here.

preprint2011arXivOpen access
Costantino SigismondiAndrea RaponiCyril BazinRichard Nugent
astro-ph.IMastro-ph.SR
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Costantino SigismondiAndrea RaponiCyril BazinRichard Nugent

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