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An instrument for measuring radiation from the surface of the earth into space.



an instrument for measuring the effective radiation of the earth’s surface, that is, the difference between the self-radiation of the earth’s surface and the atmospheric back radiation. During measurement of the effective radiation, the detecting surface of the pyrgeometer (see Figure 1) is turned alternately to the sky and the earth. The difference between the quantities obtained corresponds to the effective terrestrial radiation.

Figure 1. Detecting unit of a Savinov-lanishevskii pyrgeometer (external view)

The thermoelectric pyrgeometer of S. I. Savinov, as improved by lu. D. Ianishevskii, is used in the USSR. The detector consists of alternate coarse black strips and shiny nickel-plated strips. Because of the difference in the strips’ emissivity and absorptivity, a temperature difference is created. The thermoelectric current that arises is measured with a galvanometer. The instrument is calibrated in absolute values (caJories/cm2-min) by comparison with the readings of an Angstrom compensation pyrheliometer or by reference to black body radiation. V. A. Mikhel’son built an absolute compensation pyrgeometer with strips facing in opposite directions that permits a direct determination of the effective radiation of the earth’s surface.


Averkiev, M. S. Meteorologiia, vol. 1. Moscow, 1951.
Ianishevskii, Iu. D. Aktinometricheskie pribory i metody nabliudenii. Leningrad, 1957.


References in periodicals archive ?
Kipp & Zonen pyranometers (Kipp & Zonen 2004) and pyrgeometers (Kipp & Zonen 2001), modified to make them better suited for use on an aircraft, measured the SW and LW irradiances.
At the Intercomparison, pyranometers, pyrgeometers, UVB radiometers, shadowband radiometers and a total sky imager (TSI) were located on the platform.
Silicon-domed Eppley PIR pyrgeometers, installed at 2 m above a grassy surface, were used as receivers of longwave radiation.
The net radiation measured by the pyranometers represents net shortwave (or solar) radiant flux, and the net radiation measured by the pyrgeometers represents net longwave (or far infrared) radiant flux.
The 95% response time for the pyranometers and pyrgeometers is about 18 seconds.
On the other hand, the pyrgeometers used for longwave radiation measure radiant heat fluxes in the far infrared spectrum (5-50 [micro]m).
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