BackForwardInstrument:  ISIS 

Instrument details
Acronym ISIS
Full name Integrated Science Investigation of the Sun
Purpose To observe the composition of the solar atmosphere
Short description Suite of two instruments that take an inventory of elements in the sun's atmosphere using a mass spectrometer to weigh and sort ions in the vicinity of the spacecraft. Z range 1-26, energy/mass range 0.2-120 MeV/n
Background Consolidated technology
Scanning Technique Sun pointing from a solar orbit
Resolution N/A (full disk)
Coverage / Cycle Full solar disk, nearly continuous
Mass Power Data Rate

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: ≥2018-10 to ≥2025
Last update: 2017-06-05
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
  • Heavy ion angular flux energy and mass spectrum
  • Heavy ion flux energy and mass spectrum
  • Proton differential directional flux
Secondary mission objectives
  • Solar wind density
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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
Proton differential directional flux4 - fairNo specific limitation.Sun pointing, medium and high energy (over 40 to over 1000 keV)
Alpha particles differential directional flux1 - primaryNo specific limitation.Sun-pointing. Extended energy range (<10 to >100 MeV/n)
Solar wind density5 - marginalNo specific limitation.Solar viewing. Inferred from Proton and Alpha-particle spectroscopy
Solar wind temperature5 - marginalNo specific limitation.Solar viewing. Inferred from Proton and Alpha-particle spectroscopy
Solar wind velocity5 - marginalNo specific limitation.Solar viewing. Inferred from Proton and Alpha-particle spectroscopy
Heavy ion flux energy and mass spectrum3 - highNo specific limitation.Sun-pointing. Extended energy range (<10 to >100 MeV/n)
Heavy ion angular flux energy and mass spectrum3 - highNo specific limitation.Sun-pointing. Extended energy range (<10 to >100 MeV/n)