Atmospheric transparency and infrared astronomy at the Gornergrat

Physics – Optics

Scientific paper

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Astronomical Observatories, Atmospheric Optics, Infrared Astronomy, Switzerland, Transparence, Astronomical Photometry, Atmospheric Attenuation, Data Reduction, Infrared Windows, Radiosondes, Submillimeter Waves, Vertical Distribution, Water Vapor

Scientific paper

Atmospheric transmission at the Gornergrat Observatory in Switzerland has been measured in the infrared from 20 to 40 microns and from 300 microns to 2 mm. It is shown that the height of precipitable water, on which atmospheric transparency depends, can be directly determined by using an equation derived from the analysis of radio soundings and from local meteorological data; i.e., temperature and relative humidity. The delicate problem of photometric data reduction using a theoretical model of the atmospheric transmission is discussed.

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