BackForwardInstrument:  EFI (Polar) 

Instrument details
Acronym EFI (Polar)
Full name Electric Fields Instrument
Purpose To study the ambient vector electric field structure of the high-latitude magnetosphere, the cusp, and the plasma mantle
Short description Dual-probe instrument measuring the electric field in the range 0.1-1000 mV/m for frequency < 20 kHz
Background Part of a package of instruments to explore the Magnetosphere
Scanning Technique Travelling cross the Magnetosphere in a highly-elliptical orbit
Resolution N/A
Coverage / Cycle Large fraction of magnetosphere and ionosphere: sampling at 25 ms intervals
Mass Power Data Rate


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1996 to 2008-04-15
Last update: 2016-03-20
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 No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives
  • Electric 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
Electric Field*1 - primaryNo specific limitation.Magnetosphere. Electric field, wide dynamic range