BackForwardInstrument:  SECCHI/HI-2 

Instrument details
Acronym SECCHI/HI-2
Full name SECCHI / Heliospheric Imager 2
Purpose Extention of the observation of the K-corona, the F-corona and of Coronal Mass Ejections (CMEs) to the external heliosphere
Short description Externally occulted Lyot coronagraph, companion of HI-1 for areas in the inner heliosphere. Bandpass 450-750 nm, 50 white light images, 21 mm aperture telescope
Background Part of the package "SECCHI" (Sun-Earth Connection Coronal and Heliospheric Investigation)
Scanning Technique Array of 2048x2048 detectors binned in 1024x1024. The Sun is observed by two STEREO satellites moving in the plan of Ecliptic with different viewing conditions, so as to implement stereoscopy. Corona view included
Resolution 350,000 km at the Sun surface
Coverage / Cycle Full Sun disk each 102 min
Mass Power Data Rate


Providing Agency NRL
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2007 to 2024
Last update: 2021-12-04
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
  • Solar activity monitor
WIGOS Subcomponents
  • Subcomponent 2
  • Solar coronagraph and heliospheric imagery both on the Earth-Sun line and off the Earth-Sun line (e.g. L5 point)
  • Heliospheric imager [from solar orbit, ecliptic, L5]
Mission objectives
Primary mission objectives
  • Heliospheric image
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
Heliospheric image*1 - primaryNo specific limitation.VIS Solar heliospheric imager