BackForwardInstrument:  SWS/Tri-IPM 

Instrument details
Acronym SWS/Tri-IPM
Full name Space Weather Suite - Triple-angle Ionospheric PhotoMeter
Purpose UV spectrometry of the ionosphere performed under 3 different viewing angles
Short description Observation of the night-sky 135.6 nm oxygen airglow intensity for the retrieval of ionospheric total electrons and NmF2 (sensitivity ≥150 counts.s-1.R-1); and observation of the bright-day 135.6 nm oxygen air glow intensity and the nitrogen air glow intensity of LBH (140-180 nm)(sensitivity≥1 counts.s-1.R-1) for the retrieval of oxygen-nitrogen ratio at the ionospheric altitude. Three units which point in different directions
Background Part of the SWS (Space Weather Suite) package. Improved after the Ionospheric Photometer (IPM) flown on FY-3D
Scanning Technique Ionospheric viewing from a sunsynchronous orbit. FOV: 3.5° (along-track) × 1.6° (cross-track) Three different viewing angles
Resolution 30 km at the altitude of 300 km.
Coverage / Cycle Global daily. Sampling at 20 s intervals (oxygen) and 2 s (nitrogen)
Mass Power Data Rate


Providing Agency CMA
Instrument Maturity Flown on operational programme
Utilization Period: 2021 to 2035
Last update: 2021-09-29
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
  • Solar and space environment monitors
  • Space radiometer or spectrometer
WIGOS Subcomponents
  • Subcomponent 3
  • UV spectral imagery (e.g. GEO, HEO, MEO, LEO)
  • UV spectral imager [from GEO, HEO, MEO, LEO]
Mission objectives
Primary mission objectives
  • UV flux
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.
VariableRelevance for measuring this variableOperational limitationsExplanation
UV flux*1 - primaryNo specific limitation.Earth's limb and surface observed, wide dynamic range
UV sky image1 - primaryNo specific limitation.Earth's limb observed, high spatial resolution