ESA Data Ontology: ESADO: SUN PHOTOMETERS

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SUN PHOTOMETERS

A Sun photometer (also spelled Sunphotometer) is an instrument that measures the intensity of sunlight arriving directly from the Sun. Since it is designed to be pointed directly at the Sun, a Sun photometer measures only direct sunlight, not the diffuse light scattered from the sky, haze and clouds. Since haze blocks some direct sunlight, a Sun photometer is an ideal instrument for measuring haze. Scientists have used Sun photometers of various kinds for more than a century. The modern generation of hand held Sun photometers was pioneered in the late 1950's by Frederick Volz [1], who has made important discoveries about the effects of natural and volcanic haze on the environment. Although some Sun photometers respond to a wide range of colors or wavelengths of sunlight, most include special filters that admit only a very narrow band of wavelengths. These filters are expensive. They also have a limited life. While some filters may work well for a decade or more, others may last only a few years. Additional information available at "http://www.concord.org/haze/spwhat.html" [Summary provided by The Concord Consortium] (en)

2021-08-05 17:37:21.0 [sritz] insert AltLabel (id: null category: primary text: SUN PHOTOMETERS language code: en);

https://gcmd.earthdata.nasa.gov/kms/concept/4a210bf2-d6e5-459d-a555-d0d05155006b

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