The Nimbus-4 satellite was successfully launched on April 8, 1970. The Nimbus-4 Temperature-Humidity Infrared Radiometer (THIR) experiment replaced the HRIR and MRIR instruments flown on Nimbus-3.
THIR is a two channel high resolution scanning radiometer designed to perform two major functions:
11.5 micron channel provides both day and night cloud top or surface temperatures. The ground resolution at the sub-point is 8km and operates day and night.
6.7 micron channel gives information on the moisture content of the upper troposphere and stratosphere and the location of jet streams and frontal systems. The water vapor channel has a resolution of the sub-point is 22 km and operates mostly at night.
More information can be found in the README file or Nimbus-4 Users' Guide under the Documentation link on the menu bar.
You may download the Nimbus-4 THIR data products by selecting the "Data Holdings" link on the menu bar.
If you have questions about the Nimbus-4 THIR data, documentation or services, please let us know.