BackForwardInstrument:  HMI 

Instrument details
Acronym HMI
Full name Helioseismic and Magnetic Imager
Purpose To provide continuous full-disk coverage at high spatial and temporal resolution by line-of-sight magnetograms with channel for full Stokes polarization measurements
Short description Imaging fluxmeter with Doppler capability, operating around 617.3 nm
Background Part of a package of instruments to monitor solar activity
Scanning Technique Sun pointing from a geosynchronous (inclined) orbit
Resolution 1000 km at the Sun surface
Coverage / Cycle Full solar disk at 50 s intervals
Mass Power Data Rate 55 Mbps

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2010-05-14 to ≥2020
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
Secondary mission objectives
  • Solar VIS image
Opportunity objectives
  • Solar VIS 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
Solar VIS flux2 - very highNo specific limitation.Moderate dynamic range, polarimetry and Doppler shift exploited
Solar VIS image1 - primaryNo specific limitation.Fluxmetry with high spatial resolution, polarimetry and Doppler shift exploited
Solar magnetic field2 - very highNo specific limitation.Fluxmetry with high spatial resolution, polarimetry and Doppler shift exploited
Solar electric field2 - very highNo specific limitation.Fluxmetry with high spatial resolution, polarimetry and Doppler shift exploited
Solar velocity fields3 - highNo specific limitation.Fluxmetry with high spatial resolution, polarimetry and Doppler shift exploited