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DUST AND LIGHT POLLUTION
R. H. GARSTANG
Publications of the Astronomical Society of the Pacific
Vol. 103, No. 668 (October 1991), pp. 1109-1116
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40679793
Page Count: 8
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We have refined our model for the prediction of the brightness of the night sky due to man-made light pollution by the addition of an ozone layer, by the use of a more accurate representation of the atmospheric molecular density variation as a function of height, and by using a better mathematical representation of the scattering angular function of aerosols. Each of these modifications leads to a small reduction in the predicted brightness of the night sky. We have also added to our model a thin layer of dust of arbitrary optical thickness and height above sea level. We have studied dust clouds at various heights and of various optical thicknesses. Most of our calculations have been performed for Kitt Peak National Observatory. Most calculations have used scattering and absorption coefficients appropriate for volcanic clouds; a few calculations refer to desert dust. Light pollution is reduced by a dust cloud of moderate density whose altitude is below about 10 km (for the Vband) and increased for dust clouds at greater altitudes. Observations from good sites are not likely to be greatly affected by the increases in light pollution caused by volcanic clouds at altitudes of order 20 km.
Publications of the Astronomical Society of the Pacific © 1991 The University of Chicago Press