UO Solar Radiation Monitoring Laboratory

Home page button

Sponsors button

Site map button

Search button

Contact us button

Educational material button

SRML Glossary — "R"

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


Radiation
 
  In the context of the RReDC, synonymous with electromagnetic radiation, or the energy produced by an oscillating electrical (and magnetic) field, transmitted by photons. See Electromagnetic Spectrum.
Radiometer
 
  An instrument that measures radiance, or the radiation emitted by an object.
Radiosonde
 
  An instrument package that moves through the atmosphere, usually attached to a balloon, and transmits data over a radio frequency.
Raman Scattering
 
  Sir Chandrasekhara Venkata Raman (1888-1970) was the Indian physicist who discovered that when a beam of light passes through a liquid or a gas, it is scattered and the frequency of some of the scattered light is changed. The amount of change is a function of the scattering particles and the wavelengths of light.
Random Error
 
  The difference between the actual and the desired quantity that varies randomly; that is, if a probability distribution of differences is produced, it is the Gaussian error function.
Rayleigh Scattering
 
  The scattering of solar radiation by (mathematically spherical) particles in the atmosphere which are much smaller than the wavelength of light, analyzed by Lord Rayleigh. Rayleigh scattering explains the blue sky.
RCC
 
  Radiometer Calibration & Characterization (RCC) software is used to automate the BORCAL process. The RCC controls all data acquisition from the reference radiometers and those under calbration, displays several color-coded fields representing the present sky condition and instrument performance, builds an instrument calibration database, and generates the final calibration report.
Renewable Energy
 
  There is no formal definition for this term. Typical usage defines it as any energy source that is replenished at least as fast as it is used. Standard examples are solar, wind, hydroelectric, and biomass products.
Receiver
 
  A device that receives solar energy and converts it to useful energy forms. The following figure from Shining On illustrates several types of receivers.


Reflectance
 
  The fraction or percent of a particular frequency or wavelength of electromagnetic radiation that is reflected from the surface of a substance without being absorbed or transmitted.
Refraction
 
  The bending of electromagnetic radiation by its passage through a medium of a high refractive index. Light is refracted by passing through a lens, water, or the atmosphere.
Relative Humidity
 
  The amount of water vapor in the air expressed as the ratio between the measured amount and the maximum possible amount (the saturation point at which water condenses as dew).
Remote Sensing
 
  The determination of a quantity by detecting it from a distance. A common application of remote sensing is the use of satellite-borne instruments to determine the location and amount of resources on the surface of the Earth.
Re-radiation
 
  The re-emission of electromagnetic radiation that had been previously absorbed by a substance.
Rotating Shadow Band Radiometer
 
  An instrument that determines total solar radiation and diffuse sky radiation by periodically shading the total sky sensor from the sun with a rotating shadow band. Below is a picture of a rotating shadow band radiometer at the Solar Radiation Research Laboratory. The curved black shadowband at the right of the instrument is at rest; once every minute, it rotates 180° to obscure the sun for a few seconds, then returns to its resting position.

   


   
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

Image map links to top of page and home page
Link to top of page Link to home page
© 2000, UO Solar Radiation Monitoring Laboratory.
Last revised: December 11, 2000.


Top of page
Site map
Educational material
Home page
Search
Sponsors
Contact us

Home page URL: solardat.uoregon.edu