BackForwardInstrument:  LPT 

Instrument details
Acronym LPT
Full name Light Particle Telescope
Purpose To characterize the radiation environment at the platform
Short description Radiometer to measure electron fluxes in 33 channels in the energy range 22 keV to 19 MeV, protons (and deuterion and tritium) in 49 channels in the energy range 270 keV to 230 MeV, and alpha particles in 36 channels in the energy range 0.77 to 82 MeV/n
Background Synergistic with CARMEN to monitor the platform environment
Scanning Technique Not scanning. Pointing towards the zenit with a Field-of-View ranging from +/-10 to +/-17 degrees
Resolution N/A
Coverage / Cycle N/A
Mass Power Data Rate


Providing Agency JAXA
Instrument Maturity Flown on operational programme
Utilization Period: 2008 to 2023
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
  • In-situ plasma probes, and energetic particle spectrometers and magnetometers at GEO and LEO, and magnetic field at GEO
  • Electron sensor at LEO
  • Proton sensor at LEO
  • Alpha-particle sensor at LEO
  • Plasma density sensor at LEO
  • Plasma temperature sensor at LEO
  • Plasma velocity sensor at LEO
Mission objectives
Primary mission objectives
  • Alpha particles integral directional flux
  • Electron integral directional flux
  • Proton integral directional flux
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 integral directional flux*4 - fairNo specific limitation.Sun pointing, low, medium and high energy (up to over 400 keV)
Proton integral directional flux*4 - fairNo specific limitation.Sun pointing, medium and high energy (over 40 to over 1000 keV)
Alpha particles integral directional flux*1 - primaryNo specific limitation.Sun-pointing. Low-medium energy range (<10 up to 100 MeV/n)