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Instrument details
Acronym
HRIR
Full name
High Resolution Infrared Radiometer
Purpose
Cloud observation
Short description
Single-channel IR radiometer, 3.4-4.2 ?m, temperature range 210-330 K, NE?T 1 K @ 260 K. In Nimbus-3 the band is dual, with a 0.7-1.3 ?m bandpass that dominated the signal during daylight
Background
New development, prototype of operational IR imaging radiometers
Scanning Technique
Cross-track, horizon-to-horizon by a 45° inclined mirror, 48 rounds/min, 7.8 km line-to-line for continuous coverage
Resolution
8.5 km at s.s.p.
Coverage / Cycle
Global, twice/day
Mass
8 kg
Power
8 W
Data Rate
Analogue: 0.4 kHz base band
Providing Agency
NASA
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
1964 to 1964-09-23
Last update:
2017-03-26
Detailed characteristics
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
future satellites
Instrument classification
Earth observation instrument Passive optical radiometer or spectrometer Moderate resolution optical imager
WIGOS Subcomponents
No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives Cloud cover Land surface temperature Sea surface temperature Secondary mission objectives
Opportunity objectives Show all Show fewer
Tentative Evaluation of Measurements
The following list indicates which measurements can typically be
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
Cloud cover 5 - marginal No specific limitation. MWIR channel(s)
Fire fractional cover 5 - marginal Cloud sensitive.. Coarse spatial resolution. MWIR channels
Fire radiative power 4 - fair Cloud sensitive.. Coarse spatial resolution. MWIR channels
Fire temperature 4 - fair Cloud sensitive.. Coarse spatial resolution. MWIR channels
Land surface temperature 4 - fair Cloud sensitive.. Affected by sunlight. MWIR window channel(s) (high sensitivity to high temperature, cloud impact reduction)
Sea surface temperature 4 - fair Cloud sensitive.. Affected by sunlight. MWIR window channel(s) around 3.7 micrometers (cloud impact reduction)
Instrument: HRIR