BackForwardInstrument:  SEM (GMS) 

Instrument details
Acronym SEM (GMS)
Full name Space Environment Monitor
Purpose To measures solar particles: protons, alpha and electrons
Short description Spectral bands: 1-500 MeV (protons); 8-390 MeV (alpha particles); >2 MeV (electrons)
Background Consolidated technology
Scanning Technique N/A (in-situ in the platform environment)
Resolution N/A
Coverage / Cycle N/A
Mass Power Data Rate


Providing Agency JMA
Instrument Maturity Flown on operational programme
Utilization Period: 1977 to 1987-11-20
Last update: 2017-07-25
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 No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives
  • Alpha particles integral directional flux
  • Electron integral directional flux
  • Proton integral directional flux
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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
Electron integral directional flux5 - marginalNo specific limitation.Platform environment, high energy (over 400 keV)
Proton integral directional flux5 - marginalNo specific limitation.Platform environment, medium and high energy (over 40 to over 1000 keV)
Alpha particles integral directional flux5 - marginalNo specific limitation.Platform environment. Low-medium energy range (<10 up to 100 MeV/n)