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 ≥2022
Last update: 2021-12-16
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
WIGOS Subcomponents
  • Subcomponent 2
  • Solar magnetograph, solar EUV/X-ray imagery and EUV/X-ray irradiance, both on the Earth-Sun line and off the Earth-Sun line
  • Solar VIS spectrometer [from L1, GEO, LEO]
  • Solar VIS imager [from L1, GEO, LEO]
  • Solar magnetic field sensor [from L1, GEO, LEO]
  • Solar electric field sensor [from L1, GEO, LEO]
  • Solar velocity field sensor [from L1, GEO, LEO]
  • Subcomponent 3
  • UV spectral imagery (e.g. GEO, HEO, MEO, LEO)
  • VIS spectral imager [from GEO, HEO, MEO, LEO]
Mission objectives
Primary mission objectives
  • Solar electric field
  • Solar magnetic field
  • Solar velocity fields
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
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 field*2 - very highNo specific limitation.Fluxmetry with high spatial resolution, polarimetry and Doppler shift exploited
Solar electric field*2 - very highNo specific limitation.Fluxmetry with high spatial resolution, polarimetry and Doppler shift exploited
Solar velocity fields*3 - highNo specific limitation.Fluxmetry with high spatial resolution, polarimetry and Doppler shift exploited