BackForwardInstrument:  CELIAS 

Instrument details
Acronym CELIAS
Full name Charge, Element, Isotope Analysis
Purpose Measurement of the mass, ionic charge and energy of the low and high speed solar wind, of suprathermal ions and of low energy flare particles
Short description Particle counters and velocity measurement device based on time-of flight techniques. Z ranging from 1 to 26, energy/mass range 0.2-3000 keV/nucleon
Background Part of a package of instruments to observe the solar atmosphere
Scanning Technique Sun pointing from the L1 Lagrange libration point
Resolution N/A (full disk)
Coverage / Cycle Full solar disk nearly continuous
Mass Power Data Rate

 

Providing Agency DLR
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1996 to ≥2020
Last update: 2017-06-05
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
  • Energetic particle spectrometer
Mission objectives
Primary mission objectives
  • Alpha particles differential directional flux
  • Heavy ion flux energy and mass spectrum
  • Proton differential directional flux
Secondary mission objectives
  • Solar wind density
  • Solar wind temperature
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Tentative 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
VariableRelevance for measuring this variableOperational limitationsExplanation
Proton differential directional flux4 - fairNo specific limitation.Sun pointing, low, medium and high energy (up to over 1000 keV)
Alpha particles differential directional flux1 - primaryNo specific limitation.Sun-pointing. Low-medium energy range (<10 up to 100 MeV/n)
Solar wind density3 - highNo specific limitation.Solar viewing. Inferred from Proton and Alpha-particle spectroscopy
Solar wind temperature3 - highNo specific limitation.Solar viewing. Inferred from Proton and Alpha-particle spectroscopy
Solar wind velocity3 - highNo specific limitation.Solar viewing. Inferred from Proton and Alpha-particle spectroscopy
Heavy ion flux energy and mass spectrum3 - highNo specific limitation.Sun-pointing. Low-medium energy range (<10 up to 100 MeV/n)