BackForwardInstrument:  SEM/TED 

Instrument details
Acronym SEM/TED
Full name SEM / Total Energy Detector
Purpose To measures proton and electron fluxes at platform level
Short description Eight electrostatic analyzers and pulse height discriminators operating in two ranges: 0.05-1 keV and 1-20 keV, each measurement independently for electrons and protons.
Background Part of the packages named SEM (Space Environment Monitor) until NOAA-14, and SEM/2 (Space Environment Monitor - 2) from NOAA-15 onward and on MetOp
Scanning Technique N/A (in-situ measurement in the platform environment)
Resolution N/A
Coverage / Cycle N/A
Mass Power Data Rate

 

Providing Agency NOAA
Instrument Maturity Flown on operational programme
Utilization Period: 1979 to 1981-02-27
Last update: 2021-11-13
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
  • Electron sensor at LEO
  • Proton sensor at LEO
  • Plasma density sensor at LEO
  • Plasma temperature sensor at LEO
  • Plasma velocity sensor at LEO
Mission objectives
Primary mission objectives
  • Electron differential directional flux
  • Proton differential directional flux
Secondary mission objectives
  • Solar wind density
  • Solar wind temperature
  • Solar wind velocity
Show allShow fewer
Tentative 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
VariableRelevance for measuring this variableOperational limitationsExplanation
Electron differential directional flux4 - fairNo specific limitation.Sun pointing, low energy (up to 40 keV)
Proton differential directional flux4 - fairNo specific limitation.Sun pointing, low energy (up to 40 keV)
Solar wind density2 - very highNo specific limitation.Solar viewing. Inferred by elecron and proton spectroscopy
Solar wind temperature2 - very highNo specific limitation.Solar viewing. Inferred by elecron and proton spectroscopy
Solar wind velocity2 - very highNo specific limitation.Solar viewing. Inferred by elecron and proton spectroscopy