BackForwardInstrument:  TIRS (PREFIRE) 

Instrument details
Full name Thermal IR Spectrometer
Purpose To document, for the first time, variability in spectral fluxes from 5-53 μm on hourly to seasonal timescales
Short description Spectrometer covering the range 5-53 μm with an unapodised resolution of 0.84 μm. Uncooled.
Background New development
Scanning Technique Pushbroom, 8 cross-track 1.3° IFOV's, swath 100 km.
Resolution 12.7 km at s.s.p. (average for the two orbital altitudes)
Coverage / Cycle Global in 2 weeks for each satellite. The regular Simultaneous nadir overpasses with 2 satellites help in cross calibration.
Mass 3 kg Power 4.5 W Data Rate 12 kbps


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2024 to 2025
Last update: 2023-11-30
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
  • Broadband Earth radiation radiometer
WIGOS Subcomponents
  • Subcomponent 1
  • Absolutely calibrated broadband radiometers, and TSI and SSI radiometers
  • Broadband radiometer (for ERB)
Mission objectives
Primary mission objectives
  • Upward long-wave irradiance at TOA
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
Note: * Primary mission objective.