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Advanced Very High Resolution Radiometer (AVHRR/2)

NSSDCA ID: 1993-050A-01

Mission Name: NOAA 13
Principal Investigators:Mr. Charles C. Walton
Principal Investigators:Mr. Michael P. Weinreb


The NOAA-I Advanced Very High Resolution Radiometer (AVHRR/2) was a five-channel scanning radiometer providing global daytime and nighttime sea surface temperature, measurements of land surface processes, ice and snow monitoring and cloud dynamics. These data were obtained on a daily basis for use in weather analysis and forecasting, snow monitoring, and environmental research. The multispectral radiometer operated in the scanning mode and measured emitted and reflected radiation in the following spectral intervals: channel 1 (visible), 0.55 to 0.9 micrometer; channel 2 (near-IR), 0.725 micrometer to detector cutoff around 1.1 micrometers; channel 3 (IR window), 10.5 to 11.5 micrometers; channel 4 (IR window), 3.55 to 3.93 micrometers; and channel 5, 11.5 to 12.5 micrometers. All five channels had a spatial resolution of 1.1 km, and the two IR-window channels had a thermal resolution of 0.12 deg K at 300 deg K. The AVHRR/2 was made up of five modules: scanner modules, electronics modules, radiant cooler, optical system, and baseplate. The scanner module included an 80-pole hysteresis synchronous motor housing and a scan mirror. The scan motor continuously rotated the mirror at 360 rpm for cross-track scanning. The electronic module included systems for data processing, temperature control, telemetry, scan and motor logic. The radiant cooler consisted of four components. It's primary function was to shade the radiator surface and to operate the heater to maintain temperature control. The optical system consisted of a 20.3 cm aperature telescope and secondary optics which separated the radiant energy into spectral bands. The AVHRR/2 operated in either real-time or recorded modes. Real-time or direct readout data were transmitted to ground stations both at low (4-km) resolution via automatic picture transmission (APT) and at high (1-km) resolution via high-resolution picture transmission (HRPT). Data products included global area coverage (GAC) data at a resolution of 4 km, and local area coverage (LAC) data, which contained data from selected portions of each orbit at a 1-km resolution.

Alternate Names

  • AVHRR/2
  • NOAA13/AVHRR/2

Facts in Brief

Bit rate (avg): 660 kbps

Funding Agencies

  • NASA-Office of Space Science Applications (United States)
  • NOAA National Environmental Satellite Service (United States)


  • Earth Science: Atmospheric Dynamics
  • Earth Science: Land Surface Processes
  • Earth Science: Physical Oceanography
  • Earth Science: Land Topography

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Mr. Michael P. WeinrebPrincipal InvestigatorNOAA Office of Research and Application
Mr. Charles C. WaltonPrincipal InvestigatorNOAA Office of Research and Application
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