BackForwardInstrument:  SEM/MAG 

Instrument details
Acronym SEM/MAG
Full name SEM / Magnetometer
Purpose Observation of the geomagnetic field in the magnetosphere
Short description Assemblage of two magnetometers, each one consisting of a triaxial fluxgate sensor. Each magnetometer measures three orthogonal vector components of the magnetic field in the vicinity of the spacecraft, in the range ±0.1 to ±512 nT with resolution ±0.3 nT @ maximum of the dynamics
Background Part of the SEM (Space Environment Monitor) package
Scanning Technique In-situ measurement in GEO
Resolution N/A
Coverage / Cycle Sampling at 20 ms intervals
Mass Power Data Rate


Providing Agency NOAA
Instrument Maturity Flown on operational programme
Utilization Period: 1974 to 2033
Last update: 2021-11-10
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 1
  • In-situ plasma probes, and energetic particle spectrometers and magnetometers at GEO and LEO, and magnetic field at GEO
  • Magnetometer at GEO
Mission objectives
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 field3 - highNo specific limitation.Platform, vectorial, narrow dynamics, high resolution