BackForwardInstrument:  PREFIRE 

Instrument details
Full name Polar Radiant Energy in the Far-InfraRed Experiment
Purpose To document, for the first time, variability in spectral fluxes from 5-45 μm on hourly to seasonal timescales
Short description Description not yet fully available. Spectrometer covering the range 5-45 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
Mass 3 kg Power 6 W Data Rate 12 kbps


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2024 to 2026
Last update: 2022-10-31
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
  • Cross-nadir infrared sounder, possibly including VIS channels
WIGOS Subcomponents No WIGOS subcomponents have been defined.
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.

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Note: * Primary mission objective.