Satellites (indirect measures)

To measure the UV radiation, different types of satellites are used:

TOTAL OZONE MAPPING SPECTROMETER (TOMS)

This is an orbiting satellite which measures total ozone, cloudiness and solar radiation reflected by the upper atmosphere.

Total ozone mapping spectrometer

Advantage:

  • Can scan the entire surface of the earth.

Disadvantages:

  • TOMS satellite cannot provide an estimate of the UV radiation reaching the earth’s surface,
  • Low resolution.

For more information on this satellite, visit science.nasa.gov

METOSAT SATELLITE

This is a geostationary satellite. It measures the total solar irradiance received by the earth’s surface by reflection; this irradiance can later be modelled with additional data sources to extract UV radiation.

Metosat satellite

Advantages:

  • Takes cloud into account,
  • Distinguishes the different wavelengths,
  • Takes measurements every 20 minutes, with a resolution of approximately 10km,
  • Real-time measurements possible.

Disadvantages:

  • A primarily ecological approach,
  • Measurement affected by soil type and altitude corrections.

For more information on this satellite, visit www.soda-is.com