BackForwardInstrument:  PHI 

Instrument details
Acronym PHI
Full name Polarimetric and Helioseismic Imager
Purpose To provide high-resolution and full-disk measurements of the photospheric vector magnetic field and line-of-sight (LOS) velocity as well as the continuum intensity in the visible wavelength range. The LOS velocity maps will have the accuracy and stability to allow detailed helioseismic investigations of the solar interior, in particular of the solar convection zone
Short description Assemblage of a High Resolution Telescope (HRT) that images a fraction of the solar disk at high resolution, and a Full Disk Telescope (FDT) to image the full solar disk at all phases of the orbit. It operates on a very narrow VIS band around 617.3 nm
Background New development
Scanning Technique Observation from a solar orbit. Detector arrays
Resolution At Sun surface: 150 km (HRT) for limited areas at perihelion, 720 km (FGT) for the full disk
Coverage / Cycle Full solar disk at 1 min intervals
Mass Power Data Rate

 

Providing Agency DLR
Instrument Maturity Flown on an R&D satellite
Utilization Period: ≥2018 to ≥2028
Last update: 2017-05-19
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
  • Solar activity monitor
Mission objectives
Primary mission objectives
  • Solar electric field
  • Solar magnetic field
  • Solar velocity fields
Opportunity objectives
  • Solar VIS flux spectrum
  • Solar VIS image
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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
Solar VIS flux spectrum1 - primaryNo specific limitation.High spectral resolution, moderate dynamic range, polarimetry and Doppler shift exploited
Solar VIS image1 - primaryNo specific limitation.Spectrometry with high spatial resolution, polarimetry and Doppler shift exploited
Solar magnetic field1 - primaryNo specific limitation.Spectrometry with high spatial resolution, polarimetry and Doppler shift exploited
Solar electric field1 - primaryNo specific limitation.Spectrometry with high spatial resolution, polarimetry and Doppler shift exploited
Solar velocity fields1 - primaryNo specific limitation.Spectrometry with high spatial resolution, polarimetry and Doppler shift exploited