Glossary: R

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  1. R&D
    Research and Development. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  2. The study of interference patterns caused by radar signals; a technique that enables scientists to generate three dimensional images of the Earth's surface. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  3. 1. In optics, the point or object from which light proceeds. 2. In geometry, a straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve. 3. In astronomy, the point in the heavens from which a shower of...
  4. Energy transfer in the form of electromagnetic waves or particles that release energy when absorbed by an object. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  5. A change in the balance between incoming solar radiation and outgoing infra-red radiation. Without any radiative forcing, solar radiation coming to the Earth would continue to be approximately equal to the infra-red radiation emitted from the Earth...
  6. Theory dealing with the propagation of electromagnetic radiation through a medium. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  7. The complete range of frequencies or wave lengths of electromagnetic waves, specifically those used in radio and television. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  8. An electrical impulse sent through the atmosphere at radio frequency. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  9. Giving off or capable of giving off radiant energy in the form of particles or rays, as in alpha, beta, and gamma rays. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  10. An instrument that quantitatively measures electromagnetic radiation. Weather satellites carry radiometers to measure radiation from snow, ice, clouds, bodies of water, the Earth's surface, and the sun. Source: NASA (http://earthobservatory.nasa.gov...
  11. A balloon-borne instrument that measures meteorological parameters from the Earth's surface up to 20 miles in the atmosphere. The radiosonde measures temperature, pressure, and humidity, and transmits or 'radios' these data back to Earth. Upper air...
  12. An evergreen woodland of the tropics distinguished by a continuous leaf canopy and an average rainfall of about 100 inches per year. Rain forests play an important role in the global environment. The Earth sustains life because of critical balances...
  13. Calibrated container that measures the amount of rainfall during a specific period of time. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  14. As it happens. Source: NASA (http://earthobservatory.nasa.gov/Glossary)
  15. Actions taken to reestablish a community after a period of rehabilitation subsequent to a disaster. Actions would include construction of permanent housing, full restoration of all services, and complete resumption of the pre-disaster state.

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