Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..128..281a&link_type=abstract
(IAU, The Inside the Sun Colloquium, 121st, Versailles, France, May 22-26, 1989) Solar Physics (ISSN 0038-0938), vol. 128, July
Physics
1
Astrometry, Photolithography, Solar Diameter, Solar Interior, Diffraction Patterns, Fizeau Effect, Photometers, Solar Limb, Stellar Evolution
Scientific paper
Observed temporal variations of shape and size of the solar disk as viewed from earth may act as constraints for theories of the interior of the sun. In addition to existing programs of solar diameter measurements, a ground-based photographic method is investigated. The solar limb profile is recorded on a photoresist-coated substrate over a 20-arcsec radial length simultaneously all along the circumference as a three-dimensional 21-mm diameter, 0.0015 mm thick permanent object available for inspection by interferometric methods. The exposure time is long enough for filtering much of the atmospheric turbulence, whereas the slope of the observed solar limb should help to locate a 'standard' solar limb. The first results of February 1989 at large zenith distance and low altitude are a set of differential measurements of the position of a solar limb around a circle with, after taking into account the 3.7-arcsec atmospheric differential refraction, a 0.34-arcsec rms dispersion of the residuals for a fit to a circular solar disk. It is estimated that this method of accuracy comparable to other ground-based methods, with potentially more than 600 independent simultaneous measurements along the circumference, could help to discriminate between terrestrial and solar causes for variations of shape and size of the solar disk.
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