Distinguish between terrestrial radiation and solar radiation 

Distinguish between terrestrial radiation and solar radiation 

Terrestrial radiation (Thermal Radiation)

  • This is the energy transmitted/transferred from the earth’s surface to the atmosphere.
  • Radioactive decay of isotopes at the earth’s surface contributes to the terrestrial radiation.
  • Terrestrial radiation is transferred in the form of long waves (electromagnetic radiation) and occurs all the time both during day and night.
  • The amount of terrestrial radiation varies with the nature of the surface area and its size, e.g. water surfaces emit less radiation than land surfaces. Mountain tops also emit less than the low lands.
  • The air, water vapor and clouds take up a great deal of this energy emitted by the earth thus resulting in the rising of temperature in the atmosphere which is measured and recorded at a weather stations.,
  • Terrestrial radiation therefore results into a rise in the temperature of the atmosphere.

Solar radiation

  • Solar radiation is the energy transmitted from the sun to the earth through the atmosphere.
  • It passes in the atmosphere in form of a beam of short wave rays (solar short wave radiation).
  • Solar radiation is received in a place during the day in form of light and converted into heat at the earth’s surface.
  • The amount of solar radiation received in a place also varies from time to time. The air, clouds and the ozone absorb some of this energy while dust particles and clouds themselves reflect and scatter the energy into space.
  • The earth therefore absorbs only a fraction of the energy emitted by the sun. Albedo is used to express the ability of a surface to reflect insolation
  • Is in form of visible light rays, UV rays, X-rays and gamma rays.
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