BackForwardInstrument:  EFD 

Instrument details
Acronym EFD
Full name Electric Field Detector
Purpose To study the coupling of the E-Field in the near-Earth magnetosphere and in the ionosphere (in particular during substorms)
Short description Electric field antenna coupled to an electron beam device. Range: 0.01-10 mV/m
Background Part of a package of instruments to observe the Magnetosphere by navigating across its tail
Scanning Technique Travelling cross the Magnetosphere in a highly-elliptical orbit
Resolution N/A
Coverage / Cycle Full magnetospheric volume; sampling at 0.016 s intervals
Mass Power Data Rate


Providing Agency JAXA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1992-10-02 to ≥2022
Last update: 2021-12-10
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
  • Field or radiowave sensor
WIGOS Subcomponents
  • Subcomponent 2
  • Electric field sensor [in LEO and cross magnetosphere]
Mission objectives
Primary mission objectives
  • Electric Field
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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
Electric Field1 - primaryNo specific limitation.Magnetosphere. Electric field, wide dynamic range