Medium Resolution Infrared Radiometer
To observe integrated short-wave and long-wave radiation from Earth to Space and its main components (water vapour, window, CO2).
5-channel radiometer, two broad-band (0.2-4.0 μm and 5-30 μm), three narrow-band (6.4-6.9 μm, 10-11 μm and 14-16 μm). On Nimbus-3 the 5-30 μm channel was replaced by 20-23 μm
First Earth radiation budget instrument
Cross-track, swath 3000 km
55 km at s.s.p.
Coverage / Cycle
Global each day
Flown on an R&D satellite
1961 to 1961-12-24
Satellites this instrument is flying on
Note: a red tag indicates satellites no longer operational, a
green tag indicates operational satellites, a blue tag indicates
Earth observation instrument Passive optical radiometer or spectrometer Broadband Earth radiation radiometer
No WIGOS subcomponents have been defined.
Primary mission objectives Upward long-wave irradiance at TOA Upward short-wave irradiance at TOA Show all Show fewer
Tentative Evaluation of Measurements
The following list indicates which measurements can
retrieved from this category of instrument. To see a full Gap Analysis by Variable,
click on the respective variable.
Note: table can be sorted by clicking on the column headers
Variable Relevance for measuring this variable Operational limitations Explanation
Upward short-wave irradiance at TOA 2 - very high Information on BRDF needed. SW and LW broadband channels, and supporting narrow-bandwidth channels for cloud detection
Upward long-wave irradiance at TOA 1 - primary No specific limitation. SW and LW broadband channels, and supporting narrow-bandwidth channels for cloud detection