BackForwardInstrument:  FIMS 

Instrument details
Acronym FIMS
Full name Far Ultra Violet Imaging Spectrograph
Purpose To study the diffuse hot interstellar matter in the Far Ultraviolet (FUV) spectrum
Short description Far UV imaging spectograph employing a dual bandpass (900-1175 Ä and 1335-1750 Ä), with high spectral resolution (1.5 Ä and 2.5 Ä, respectively)
Background New development
Scanning Technique Arrays of 512 x 512 detectors for each band. Field of view 8º x 5', angular resolution 5 arcmin. Alternatively addressable towards the airglow, towards the aurora regions or towards the open sky, from a sunsynchronous orbit
Resolution 4.77° corresponding to 58 km at Earth's surface
Coverage / Cycle Full interplanetary space in 100 min (orbital period) including magnetosphere and ionosphere. Sampling at 10 s intervals
Mass 20 kg Power 20 W Data Rate


Providing Agency KARI
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2003 to 2005
Last update: 2017-05-21
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 2
  • Magnetospheric energetic particles and magnetometers
  • Ionospheric electron density sensor [in LEO and cross magnetosphere]
  • Ionospheric plasma density
  • Subcomponent 3
  • UV spectral imagery (e.g. GEO, HEO, MEO, LEO)
  • UV spectral imager [from GEO, HEO, MEO, LEO]
  • Heliospheric imager [from GEO, HEO, MEO, LEO]
Mission objectives
Primary mission objectives
  • Heliospheric image
  • UV flux spectrum
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 spectrum*1 - primaryNo specific limitation.Earth's limb observed, high spectral resolution
UV sky image2 - very highNo specific limitation.Earth's limb observed, spectrometry with coarse spatial resolution
Heliospheric image*2 - very highNo specific limitation.Interplanetary space viewing in the UV band (121.6-393.4 nm)
Aurora2 - very highNo specific limitation.Observed down to Earth's surface in UV (121.6-393.4 nm)
Ionospheric plasma density5 - marginalNo specific limitation.UV imaging spectrometer measuring ionospheric plasma density in the Earth's limb
Electron Density5 - marginalNo specific limitation.UV spectrometry of the Earth's limb