BackForwardInstrument:  SEM-N/SSJ5 

Instrument details
Acronym SEM-N/SSJ5
Full name SEM-N / Special Sensor Precipitating Electron and Ion Spectrometer
Purpose Measurement of transfer energy, mass, and momentum of charged particles through the magnetosphere-ionosphere in the Earth's magnetic field
Short description Electrostatic analyzer for electron in the energy range 0.03-30 keV and ions with Z from 1 to 26 in the energy range 0.03-30 keV/n
Background Part of the SEM-N (Space Environment Monitor for NPOESS) package. Follow-on of the SSJ5 instrument flown within the SESS (Space Environment Sensor Suite) package of DMSP F16 to S20
Scanning Technique N/A (in-situ measurement in the platform environment)
Resolution N/A
Coverage / Cycle N/A
Mass Power Data Rate

 

Providing Agency DoD
Instrument Maturity Flown on operational programme
Utilization Period: 2000 to ≥2038
Last update: 2017-06-04
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
Mission objectives
Primary mission objectives
  • Alpha particles differential directional flux
  • Electron differential directional flux
  • Heavy ion flux energy and mass spectrum
  • Proton differential directional flux
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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 flux5 - marginalNo specific limitation.Platform environment, low energy (up to 40 keV)
Proton differential directional flux5 - marginalNo specific limitation.Platform environment, low energy (up to 40 keV)
Alpha particles differential directional flux5 - marginalNo specific limitation.Platform environment. Low-medium energy range (<10 up to 100 MeV/n)
Heavy ion flux energy and mass spectrum5 - marginalNo specific limitation.Platform environment. Low-medium energy range (<10 up to 100 MeV/n)