Computer Science
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003kfnt...19..352d&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 19, no. 4, p. 352-366
Computer Science
Scientific paper
Total solar eclipse light curves observed with photoelectric photometers can be used to determine the Sun's angular diameter. For this purpose, it is necessary to obtain high-accuracy light curves observed and calibrated and to construct adequate theoretical simulations. We propose a way to construct a theoretical eclipse light curve which takes into accountc the solar visible disc limb darkening function, brightness distribution of the chromosphere out of the Sun's disc, and Moon's disc limb irregularities. The effect of the Sun's rays diffraction on the lunar disc limb is evaluated. We describe a procedure for the construction of eclipse light curves from 11 August 1999 photometric observational data which are calibrated on the full Sun's disc luminosity, rms errors of the light curves being no more than 10%. Theoretical light curves are constructed for each observational place under certain assumptions on the solar disc limb darkening function and brightness distribution of the chromosphere out of the disc. A comparison of the theoretical and observational light curves shows that the observational procedure and data reduction are free from crude errors and chief factors are taken into account correctly in our procedure of the construction of theoretical eclipse light curves.
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