Instrument : Normal Incidence Multifilter Radiometer (NIMFR)

Instrument Categories
Aerosols, Radiometric

Picture of the Normal Incidence Multi-Filter Radiometer (NIMFR)

General Overview

The Normal Incidence Multifilter Radiometer (NIMFR) is a ground-based instrument that provides a time series of the shortwave spectral direct normal irradiance. Additionally, there is a broadband silicon detector that can crudely measure the direct normal broadband irradiance. These irradiance measurements can be used to infer clear sky aerosol optical depth and columnar abundances of ozone and water vapor. The NIMFR is one of a class of instruments known as sun photometers.

Output Value-Added Products

This instrument is an input to the following value-added products, which provide improved measurements or derived quantities.

  • mfrsraod1mich : MFRSR: derived total & aerosol optical depth from 1st Michalsky algorithm
  • nimfraod1mich : NIMFR: derived total & aerosol optical depth from 1st Michalsky algorithm
  • sasheniraod : Shortwave Array Spectroradiometer-Hemispheric, NIR Aerosol Optical Depths
  • sashevisaod : Shortwave Array Spectroradiometer-Hemispheric, VIS Aerosol Optical Depths

Output Datastreams

  • nimfr : Normal Incidence Multi-Filter Radiometer (NIMFR): direct normal irradiances

Primary Measurements

The following measurements are those considered scientifically relevant.


North Slope Alaska
NSAC1 Browse Data Browse PlotsCentral Facility, Barrow AK
NSAC2 Browse DataCentral Facility, Atqasuk AK retired
Southern Great Plains
SGPC1 Browse DataCentral Facility, Lamont, OK
 retired = Originating instrument has been retired at this location


Gary Hodges
(303) 497-6460