Instrument : Narrow Field of View Zenith Radiometer (NFOV)

Instrument Categories
Radiometric, Cloud Properties

Picture of the Narrow Field of View Zenith Radiometer (NFOV)

General Overview

The Narrow Field of View Zenith Radiometer (NFOV) is a ground-based radiometer that looks straight up. As implied by the name, the field of view of the instrument is narrow, thus permitting the measurement of the downwelling zenith radiance. The output of the instrument consists of a time series of 1-sec observations of the zenith spectral radiance. The radiance is measured at a wavelength of 869 nm. Data from the instrument have many uses; for example, the internal structure of clouds may be characterized by examining a time series of the radiance data.

Output Datastreams

  • nfov : Narrow Field of View (NFOV)
  • nfov2ch : Narrow Field of View-2 channel (NFOV2CH)

Primary Measurements

The following measurements are those considered scientifically relevant.


Southern Great Plains
SGPC1 Browse DataCentral Facility, Lamont, OK retired
ARM Mobile Facility
FKBM1 Browse Data Browse PlotsBlack Forest, Germany retired
GRWM1 Browse Data Browse PlotsGraciosa Island, Azores, Portugal; AMF1 retired
HFEM1 Browse Data Browse PlotsShouxian, Anhui, China retired
MAOM1 Browse Data Browse PlotsManacapuru, Amazonas, Brazil; AMF1
PGHM1 Browse Data Browse PlotsARIES Observatory, Nainital, Uttarkhand, India; AMF1 retired
PVCM1 Browse Data Browse PlotsHighland Center, Cape Cod MA; AMF1 retired
PYEM1 Browse Data Browse PlotsPoint Reyes, CA retired
 retired = Originating instrument has been retired at this location


Gary Hodges
(303) 497-6460