nimfr: Normal Incidence Multifilter Radiometer

The Normal Incidence Multifilter Radiometer (NIMFR) is a ground-based instrument that provides a time series of the shortwave spectral direct normal irradiance. Additionally, a broadband silicon detector 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.


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications


Kassianov E, J Monroe, L Riihimaki, C Flynn, E Cromwell, G Hodges, and A McComiskey. 2018. Climatology of aerosol optical depth at mid-continental US site: ground-based observations. In SPIE Remote Sensing, 2018, Berlin, Germany, .


Kassianov E, C Flynn, A Koontz, C Sivaraman, and J Barnard. 2013. "Failure and redemption of MFRSR/NIMFR cloud screening: Contrasting algorithm performance at ARM NSA and SGP sites." Atmosphere, 4(3), 10.3390/atmos4030299.

Koontz A, G Hodges, J Barnard, C Flynn, and J Michalsky. 2013. Aerosol Optical Depth Value-Added Product Report. U.S. Department of Energy. DOE/SC-ARM/TR-129.


Flynn C, DD Turner, A Koontz, D Chand, and C Sivaraman. 2012. Aerosol Best Estimate (AEROSOLBE) Value-Added Product. DOE ARM Climate Research Facility. DOE/SC-ARM/TR-115.


Hodges GB and JJ Michalsky. 2011. Multifilter Rotating Shadowband Radiometer (MFRSR) Handbook; with Subsections for the Following Derivative Instruments: Multifilter Radiometer (MFR); Normal Incidence Multifilter Radiometer (NIMFR). U.S. DOE, Office of Science, Office of Biological and Environmental Research. DOE/SC-ARM/TR-059.


Michalsky J, F Denn, C Flynn, G Hodges, P Kiedron, A Koontz, J Schlemmer, and SE Schwartz. 2010. "Climatology of aerosol optical depth in north-central Oklahoma: 1992–2008." Journal of Geophysical Research – Atmospheres, 115(D7), D07203, 10.1029/2009jd012197.
Research Highlight

Ferrare R, C Hostetler, J Hair, A Cook, D Harper, S Burton, M Obland, R Rogers, A Swanson, D Turner, N O'Neill, and P Colarco. 2010. Airborne HSRL Aerosol, Ice, and Cloud Observations During ARCTAS/ISDAC. Presented at Atmospheric System Research (ASR) Science Team Meeting.


Koontz A, D Flynn, G Hodges, J Barnard, E Kassianov, and C Flynn. 2009. ARM Multi-year/Multi-site MFRSR Aerosol Optical Depth Assessment. Presented at Atmospheric Radiation Measurement (ARM) Science Team Meeting.


Voyles JW. 2007. ACRF Instrumentation Status: New, Current, and Future September – October 2007. DOE ARM Climate Research Facility. DOE/SC-ARM/P-07-002.8.


Wang J, SA Christopher, US Nair, JS Reid, EM Prins, J Szykman, and JL Hand. 2006. "Mesoscale modeling of Central American smoke transport to the United States: 1. “Top-down” assessment of emission strength and diurnal variation impacts." Journal of Geophysical Research – Atmospheres, 111(D5), 10.1029/2005jd006416.

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