Radiation is the process by which energy can be transferred from one body to another through electromagnetic waves in the absence of an intervening medium. If an intervening medium is present, it must be at least partially transparent in order for the radiant energy transfer to take place. Energy is continuously radiated from all substances that are above absolute zero (0 K) in temperature. If a black body is warmer than its environment, it radiates more energy than it receives and the environment receives more energy than it radiates. There is, thus, a net transfer of energy from the warm black body to the cooler environment. The basic problem is to determine the direction and rate of this net energy transfer.
KeywordsInternal Resistance Longwave Radiation Global Solar Radiation Shadow Band Photopic Vision
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- Coulson, Kinsell L. (1975). Solar and Terrestrial Radiation. Academic, New York. 322 pp.Google Scholar
- Reifsnyder, W. E., and H. W. Lull (1965). Radiant energy in relation to forest. U.S. Dep. Agric. Tech. Bull. 1344.Google Scholar
- Robinson, N. (1966). Solar Radiation. Elsevier, New York. 347 pp.Google Scholar
- World Meteorological Organization (1971). Guide to Meteorological Instrument and Observing Practices. World Meteorological Organization, Geneva, Switzerland.Google Scholar
- I.G.Y. (1958). Instrumentation Manual 6, Radiation Instruments and Measurements. Pergamon, New York, N.Y.Google Scholar
- Alrich, L. B., H. Wexler, S. Fritz, I. F. Hand, A. Court and W. P. Mellen, 1947. Comments by Readers. Sci. 106:225.Google Scholar
- Blackwell, M. J. (1954). Five Years Continuous Recording of Daylight Illumination at Kew Observatory. Met. Res. Ctr. Air Ministry, London M.R.P. No. 831.Google Scholar
- Funk, J. P. (1961). A note on the longwave calibration of convectively shielded net radiometers. Arch. Meteorol. Geophys. Bioklimatol. Ser. B 11:70–74.Google Scholar
- Gier, J. T. and R. V. Dunkle (1951). Total hemispherical radiometers. AIEE Trans. 70: 1–7.Google Scholar
- Johnson, D. S. (1956). Progress Report on Radiometer Test. U.S. Weather Bureau unpublished mimeogr. rpt. December, 20 pp.Google Scholar
- Latimer, J. R. (1971). Radiation measurement. International Field Year for the Great Lakes. Tech. Manual Ser. 2. Canadian National Committee for the International Hydrological Decade. No. 8 Building, Carling Avenue, Ottawa, Canada, p. 52.Google Scholar
- Tanner, C. B., C. A. Federer, T. A. Black, and J. B. Swan (1969). Economical Radiometer, Theory, Performance, and Construction. Research Report 40. College of Agriculture and Life Sciences, Univ. of Wisconsin, Madison, Wisc. p. 86.Google Scholar