BackForwardInstrument:  EDI 

Instrument details
Acronym EDI
Full name Electron Drift Instrument
Purpose Accurate and highly sensitive measurements of the electric field in the Magnetosphere
Short description Two emitter/detector assemblies for hemispheric view; sensitivity for electric field 0.1-10 mV/m for < 100 Hz, to magnetic field 5-1000 nT with resolution 0.1 nT @ maximum of the dynamics
Background Part of a package of instruments for the study of the Magnetosphere
Scanning Technique Formation flight of 4 satellites in coordinated high-elliptical orbits cross the Magnetosphere for 3-D field reconstruction
Resolution N/A
Coverage / Cycle Full magnetospheric volume; sampling at 6 ms intervals
Mass Power Data Rate


Providing Agency ESA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2000-08-09 to 2000-08-09
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
  • Magnetospheric energetic particles and magnetometers
  • Geomagnetic field sensor [in LEO and cross magnetosphere]
  • Electric field sensor [in LEO and cross magnetosphere]
Mission objectives
Primary mission objectives
  • Electric Field
  • Geomagnetic field
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
Geomagnetic field*1 - primaryNo specific limitation.Cluster in magnetosphere, scalar, narrow dynamics, high resolution
Electric Field*1 - primaryNo specific limitation.Cluster in the magnetosphere. Electric field, poor dynamic range