BackForwardInstrument:  IMPACT/SEP 

Instrument details
Acronym IMPACT/SEP
Full name IMPACT / Solar Energetic Particles
Purpose Observation of solar electrons, protons and heavier ions
Short description Package of 4 separate instruments to measure electrons, protons and heavier ions from several tens of keV to approximately 100 MeV: Solar Electron Proton Telescope (SEPT), Suprathermal Ion Telescope (SIT), Low Energy Telescope (LET), High Energy Telescope (HET). Energy ranges: electrons: 20-40 keV (flux) and 0.2-5 MeV (spectrum); protons: 0.02-7 MeV (flux) and 0.02-100 MeV (spectrum); alpha-particle spectrum: 0.12-400 MeV; ions spectrum: 0.03-30 MeV/n for Z from 3 to 26
Background Part of the IMPACT (In-situ Measurements of Particles and CME Transients) instrument package
Scanning Technique Interplanetary space observation from two variable positions along the Earth’s orbit around the Sun to implement stereoscopy
Resolution N/A
Coverage / Cycle Full interplanetary spece
Mass Power Data Rate

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2007-01-21 to ≥2020
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
Secondary mission objectives
  • Electron integral 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 integral directional flux3 - highNo specific limitation.Interplanetary space, low, medium and high energy (up to over 400 keV)
Electron differential directional flux3 - highNo specific limitation.Interplanetary space, low, medium and high energy (up to over 400 keV)
Proton integral directional flux1 - primaryNo specific limitation.Cluster flown through the magnetosphere, high energy (over 1000 keV)
Proton differential directional flux3 - highNo specific limitation.Interplanetary space, high energy (over 1000 keV)
Alpha particles differential directional flux2 - very highNo specific limitation.Interplanetary space. Low-medium energy range (<10 up to 100 MeV/n)
Solar wind density1 - primaryNo specific limitation.Interplanetary space. Infrerred from Proton. Electron and Alpha-particle spectroscopy
Solar wind temperature1 - primaryNo specific limitation.Interplanetary space. Infrerred from Proton. Electron and Alpha-particle spectroscopy
Solar wind velocity1 - primaryNo specific limitation.Interplanetary space. Infrerred from Proton. Electron and Alpha-particle spectroscopy
Heavy ion flux energy and mass spectrum4 - fairNo specific limitation.Interplanetary space. Low-medium energy range (<10 up to 100 MeV/n)