Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1926
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1926apj....64..273f&link_type=abstract
Astrophysical Journal, vol. 64, p.273-286
Astronomy and Astrophysics
Astrophysics
Illumination: Solar Corona, Full Moon
Scientific paper
Visual measures of the total light of the corona were made by matching the illumination produced in the field of the ocular of the Hartmann microphotometer with that from a glow-lamp of known candle-power. The light from the lamp passed through a blue filter and a photographic wedge, the match being produced by motion of the wedge. Settings made through blue, green and no ocular filters were most satisfactory with the green filter. The effect of the sky-background was indicated by measures of the sky 8 degrees east of the sun. Comparison with similar observations of the moon on six nights showed the illumination produced by the corona to be 0.27 that of the full moon. Selective transmission of the atmosphere is suggested by the different factors for the transmission of the lamp-filter necessary on different nights. The candle-power deduced for the corona is 0.04 meter-candles; for the full moon, 0.16 meter-candles.
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