BackForwardInstrument:  SEDA 

Instrument details
Acronym SEDA
Full name Space Environment Data Acquisition monitor
Purpose Monitoring fluxes of electrons and protons in the platform environment
Short description 8-channel particle counter to measure the fluxes of protons in the range 15-100 MeV and electrons in the range 0.2-5 MeV. Time resolution: 10 s
Background Also flown on Galileo satellites with the name EMU (Environmental Monitor Unit)
Scanning Technique N/A (in-situ measurement in the platform environment)
Resolution N/A
Coverage / Cycle Field of view ± 39.35° for protons, ± 78.3° for electrons
Mass 3.5 kg Power 8 W Data Rate


Providing Agency JMA
Instrument Maturity Flown on operational programme
Utilization Period: 2015-07-07 to ≥2031
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
Mission objectives
Primary mission objectives
  • 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, medium and high energy (over 40 to over 400 keV)
Proton integral directional flux5 - marginalNo specific limitation.Platform environment, high energy (over 1000 keV)