BackForwardInstrument:  EUI 

Instrument details
Acronym EUI
Full name Extreme Ultraviolet Imager
Purpose To provide image sequences of the solar atmospheric layers above the photosphere, thereby providing an indispensable link between the solar surface and outer corona that ultimately shapes the characteristics of the interplanetary medium
Short description Suite composed of two High Resolution Imagers (HRI), one at Lyman-alpha (121.6 nm) and one in the extreme UV at 174 Å, and one dual band Full-Sun Imager (FSI) working alternatively at the 174 and 304 Å EUV passbands [including He-II at 30.4 nm]
Background New development
Scanning Technique Observation from a solar orbit. Detector arrays of 2000 x 2000 (HRI) and 3000 x 3000 (FSI)
Resolution 1” (HRI) and 9” (FSI)
Coverage / Cycle Full solar disk at 2 s intervals
Mass Power Data Rate


Providing Agency BIRA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2020 to ≥2030
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
  • Solar activity monitor
WIGOS Subcomponents
  • Subcomponent 2
  • Solar magnetograph, solar EUV/X-ray imagery and EUV/X-ray irradiance, both on the Earth-Sun line and off the Earth-Sun line
  • Solar EUV spectrometer [from solar orbit, ecliptic, L5]
  • Solar EUV imager [from solar orbit, ecliptic, L5]
Mission objectives
Primary mission objectives
  • Solar EUV image
  • Solar Lyman-alpha image
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
Solar EUV flux4 - fairNo specific limitation.Few channels, moderate dynamic range
Solar EUV image*3 - highNo specific limitation.Fluxmetry with high spatial resolution
Solar Lyman-alpha flux2 - very highNo specific limitation.H-Ly-alpha at 121.6 nm (EUV/UV boundary)
Solar Lyman-alpha image*2 - very highNo specific limitation.H-Ly-alpha at 121.6 nm (EUV/UV boundary), high spatial resolution