Physics
Scientific paper
Dec 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973stin...7514699c&link_type=abstract
Unknown
Physics
Hollow, Solar Magnetic Field, Sunspots, Visual Photometry, Geometry, Inclination, Optical Density, Optical Thickness, Penumbras, Photosphere, Position (Location), Solar Limb, Transparence
Scientific paper
By consideration of photographic reproductions of a large sunspot on the limb which appeared on 24 September 1971, an attempt to determine the Wilson depression was made. Readings of photometric signals from an exploring telecamera were taken. For various heliocentric distances the separation between the ellipse centers representing the penumbra and the nucleus was determined together with the ratio between the depression and the actual penumbra diameter. The mean inclination of the penumbra and the angular variation of the relative nucleus section were also studied. Variations of the mean penumbra inclination with heliocentric distance are in agreement with theoretical estimates based on optical layer transparencies, and the absolute value of the measured depression is in agreement with forecasts when the associated magnetic field is taken into account.
Croce Vincenzo
Ferrari Toniolo M.
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