Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1059..183s&link_type=abstract
RELATIVISTIC ASTROPHYSICS: 5th Sino-Italian Workshop on Relativistic Astrophysics. AIP Conference Proceedings, Volume 1059, pp.
Astronomy and Astrophysics
Astrophysics
3
Eclipses, Transits, And Occultations, Radio Telescopes And Instrumentation, Heterodyne Receivers, Interstellar Medium And Nebulae In External Galaxies, Background Radiations, Supernova Remnants, Spectroscopy And Spectrophotometry, Galactic Winds And Fountains
Scientific paper
The theme of solar diameter variability is presented with the data of solar astrolabes, the four data points of the Solar Disk Sextant and the central eclipses observed near the shadow's limbs. All data are from the last 3 decades. The results obtained with solar astrolabes are different from Northern (Calern) and Southern hemisphere (Rio de Janeiro, Santiago), this is possibly due to atmospheric effect. Eclipses measurements are not affected by atmospheric turbulence because the event's geometry is determined outside the atmosphere, they give systematically larger diameter values than astrolabes. Videos of eclipses are discussed in term of projection on a screen versus direct imaging at the focal plane with filtered telescope. Relations between filters densities, telescope diameters, frame rate of video cameras, and portion of the outer solar limb lost during eclipse imaging are presented. Loss of 0.02'' are typical for 10 cm ND5 filtered telescope. A commercial 60 fps camcorder for Baily beads timing is discussed in terms of signal-to-noise ratio.
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