BackForwardInstrument:  SEM/IMS 

Instrument details
Acronym SEM/IMS
Full name Space Environment Monitor - Ionosphere Measurement Sensor
Purpose To measure ionospheric electron temperature and density, and platform charge and dose
Short description Specially arranged Lanfmuir Probe for electron temperature (0-1 eV) and density in the 10- 10^6 e/cm3 range
Background Part of the Space Environment Monitor of FY-1 and FY-3 A/B satellites
Scanning Technique In-situ measurement in a sunsynchronous orbit
Resolution N/A
Coverage / Cycle N/A
Mass Power Data Rate


Providing Agency CMA
Instrument Maturity Flown on operational programme
Utilization Period: 1988 to 2020
Last update: 2022-07-25
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
  • Electron sensor at LEO
Mission objectives
Primary mission objectives
  • Electrostatic charge
  • Radiation Dose Rate
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
Electron Density4 - fairNo specific limitation.Platform. Electron density
Radiation Dose Rate*3 - highNo specific limitation.Platform. Dose
Electrostatic charge*3 - highNo specific limitation.Platform. Electrostatic charge