UO Solar Radiation Monitoring Laboratory

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SRML Glossary — "G"

Special thanks to NREL

We'd like to thank the National Renewable Energy Laboratory for making available to us their glossary, which is the basis of ours. We've edited and reformatted it, and linked it to our Web pages, and we'll continue to add our own specialized terms, illustrations, and examples. Please note that the Solar Radiation Monitoring Laboratory takes full responsibility for any inaccuracies that may occur.

Links to other glossary sections:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Gigawatt
 
  1,000,000,000 (or 109) Watts. This unit rose to public prominence in the 1985 motion picture Back to the Future in which 1.21 gigawatts of power were required for the time-travelling vehicle.
Global Horizontal Radiation
 
  Total solar radiation; the sum of direct, diffuse, and ground-
reflected radiation
; however, because ground reflected radiation is usually insignificant compared to direct and diffuse, for all practical purposes global radiation is said to be the sum of direct and diffuse radiation only.

Click Shining On (Figure 3) to see solar components


Greenhouse Effect
 
  The warming of the Earth by the atmosphere because of water vapor and gases such as carbon dioxide, which absorb and emit infrared radiation, or heat. Thus, the high-energy photons such as light and ultraviolet radiation are passed through the atmosphere to the Earth, which tends to absorb them and emit lower-energy photons which are then captured in the atmosphere and partially sent back to Earth. As the presence of infrared absorbers rises in the atmosphere, the more solar energy is retained at heat in the atmosphere and on the surface of the Earth. Because glass also passes light and tends to absorb and reflect heat, this effect is compared to that of a greenhouse.
Ground-
Reflected Radiation
 
  The radiation from the sun which is reflected back into the atmosphere after striking the Earth.

Click Shining On (Figure 3) to see solar components


   
Links to other glossary sections:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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© 2000, UO Solar Radiation Monitoring Laboratory.
Last revised: December 11, 2000.


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