BackForwardInstrument:  SEP/MEPS 

Instrument details
Acronym SEP/MEPS
Full name Space Environment Package / Medium Energy Particles Sensor
Purpose Space weather - Monitoring charged particles at platform level
Short description Set of counters for electrons (30-600 keV) and protons (30-1000 keV)
Background Component of the Space Environment Package (SEP)
Scanning Technique N/A (in-situ in the platform environment)
Resolution N/A
Coverage / Cycle Field of view 60° (protons) and 25° (electrons)
Mass Power Data Rate


Providing Agency CMA
Instrument Maturity Flown on operational programme
Utilization Period: 2021 to 2040
Last update: 2023-09-21
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
  • Energetic particle spectrometer
WIGOS Subcomponents
  • Subcomponent 1
  • In-situ plasma probes, and energetic particle spectrometers and magnetometers at GEO and LEO, and magnetic field at GEO
  • Electron sensor at LEO
  • Proton sensor at LEO
Mission objectives
Primary mission objectives
  • Electron integral directional flux
  • Proton integral directional 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
Electron integral directional flux*5 - marginalNo specific limitation.Platform environment, low, medium and high energy (up to over 400 keV)
Proton integral directional flux*5 - marginalNo specific limitation.Platform environment, low and medium energy (up to 1000 keV)