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<https://gcmd.earthdata.nasa.gov/kms/concept/293213eb-9d76-4b9b-9504-3bd13fa1ec76>
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  skos:definition """[Image Source: NOAA, http://www.ozonelayer.noaa.gov/action/sbuv2.htm ]

[Text Source: NASA POES Project home page, http://goespoes.gsfc.nasa.gov/poes/instruments/sbuv.html ]

The SBUV/2 is a nadir-pointing nonspatial spectrally scanning ultraviolet radiometer carried in two modules. The two modules are the Sensor Module with the optical elements/detectors and the Electronics Module. The overall radiometric resolution is approximately 1 nanometer (nm). Two optical radiometers form the heart of the instrument: a monochrometer and a “Cloud Cover Radiometer” (CCR). The monochrometer measures the Earth radiance directly and selectively the Sun when a diffuser is deployed. The CCR measures the 379-nm wavelength and is coaligned to the monochrometer. The output of the CCR represents the amount of cloud cover in a scene and is used to remove cloud effects in the monochrometer data.

The SBUV/2 measures solar irradiance and Earth radiance (backscattered solar energy) in the near ultraviolet spectrum (160 to 400 nm). The following atmospheric properties are measured from this data:
 
 - The global ozone concentration in the stratosphere to an absolute accuracy of 1 percent.
 - The vertical distribution of atmospheric ozone to an absolute accuracy of 5 percent.
 - The long-term solar spectral irradiance from 160 to 400 nm Photochemical processes and the influence of “trace” constituents on the ozone layer.


Group: Instrument_Details
   Entry_ID: SBUV/2
   Group: Instrument_Identification
      Instrument_Category: Solar/Space Observing Instruments
      Instrument_Class: Ultraviolet Instruments
      Short_Name: SBUV/2
      Long_Name: Solar Backscatter Ultraviolet/2
   End_Group
   Group: Associated_Platforms
      Short_Name: NOAA-15
      Short_Name: NOAA-16
      Short_Name: NOAA-17
      Short_Name: NOAA-18
      Short_Name: NOAA-19
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Ultraviolet
      Number_Channels: 12
      Spectral_Frequency_Coverage_Range: 252.00 ± 0.05 nm - 339.89 ± 0.05 nm
   End_Group
   Online_Resource: http://goespoes.gsfc.nasa.gov/poes/instruments/sbuv.html
   Online_Resource: http://www.ozonelayer.noaa.gov/action/sbuv2.htm
   Online_Resource: http://www.ncdc.noaa.gov/oa/pod-guide/ncdc/docs/klm/html/c3/sec3-8.htm
   Sample_Image: http://www.ozonelayer.noaa.gov/action/poessat.gif
   Group: Instrument_Logistics
      Instrument_Owner: USA/NASA
      Instrument_Owner: USA/NOAA
   End_Group
End_Group"""@en ;
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