BackForwardInstrument:  EFI 

Instrument details
Acronym EFI
Full name Electric Field Instrument
Purpose To measure the ambient electric field associated with plasma flow and electromagnetic fluctuations in the low-altitude cusp.
Short description

Each EFI consists of an orthogonal pair of double-probe electric field sensors with sphere-to-sphere spacing of 7 meters deployed via 3 meter stacer booms in the spacecraft spin plane for the DC/low frequency (LF) sections, and two of the four stacer boom surfaces for the high frequency (HF) measurements (two 3 meter monopoles, separated by 1 meter at the root). 
Background
Scanning Technique
Resolution Accuracy ± 1 mV/m
Coverage / Cycle
Mass Power Data Rate

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2025 to 2026
Last update: 2025-07-28
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
  • Subcomponent 1
  • In-situ plasma probes, and energetic particle spectrometers and magnetometers at GEO and LEO, and magnetic field at GEO
  • Electron sensor at LEO
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.