Measurement : Shortwave narrowband direct downwelling irradiance

The direct unscattered radiant energy from the Sun, in a narrow band of wavelengths shorter than approximately 4 {mu}m, passing through a horizontal unit area in a downward direction.



The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes.

  • ARM Instruments
    • SASHE : Shortwave Array Spectroradiometer-Hemispheric
  • Field Campaign Instruments
    • SOAR : Shipboard Oceanographic and Atmospheric Radiation
    • OTTER : Twin Otter
    • UAV-EGRETT : UAV-Egrett


  • SASHE : Shortwave Array Spectroradiometer-Hemispheric Datastreams
    • SASHEMFR : Pixels from SASHe corresponding to MFR radiometer wavelengths
    • SASHENIR : Shortwave Array Spectroradiometer-Hemispheric, Near-InfraRed channel
    • SASHEVIS : Shortwave Array Spectroradiometer-Hemispheric, VISible channel