On the center to limb variation of the granular brightness fluctuations

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Brightness, Radial Distribution, Solar Atmosphere, Solar Granulation, Astronomical Photometry, Atmospheric Effects, Data Acquisition, Imaging Techniques, Solar Limb

Scientific paper

The center to limb variation of the granular brightness contrast was studied on the basis of slit-jaw photographs obtained with the balloon-borne Spektro-Stratoskop telescope, flown at an altitude of about 28 km on May 17, 1975 and during the partial solar eclipse of April 26, 1976 on Tenerife. Positions concentrate at cosine theta values of about 1, 0.6 and 0.2. The granular contrast was found to decrease monotonically towards the solar limb, with the magnitude of contrast about three times smaller at cosine theta 2 than at the disk center. The relative center to limb variation was found to be 10.4% (eclipse observations by a 40 cm evacuated Newtonian reflector at 422 nm) and 8.6% (Spektro-Stratoskop observations at 556 nm). Discrepancies between these results and those reported by Deubner and Mattig (1975) are thought to be due to corrections for photographic noise and other factors.

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