Abstract
IN a recent letter Poultney1 has examined the evidence in favour of the existence of an atmospheric dust layer in the region about 85 km above the Earth's surface. In particular he claims that there is reliable evidence for this claim from observations using the ground based experimental method of examining the intensity of light back scattered from a vertical laser beam, or what is called laser radar. This technique is in use at several stations including Cambridge, Mass., U.S.A.2; College Park, Maryland, U.S.A.3; Kingston, Jamaica4; and Slough, England5.
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References
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Bain, W. C., and Sandford, M. C. W., Nature, 210, 826 (1966).
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CLEMESHA, B., KENT, G. & WRIGHT, R. Optical Radar Evidence for Atmospheric Dust Layers around 85 km Altitude. Nature 214, 261–262 (1967). https://doi.org/10.1038/214261b0
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DOI: https://doi.org/10.1038/214261b0
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