BackForwardInstrument:  LST 

Instrument details
Acronym LST
Full name Lyman-alpha Solar Telescope
Purpose To image the solar disk and corona in the Lyman-alpha wavebands and other UV/VIS bands.
Short description LST is comprised of 3 imagers a Solar Disk Imager a Solar Corona Imager and a White-light Solar Telescope. For the solar disk it measures EUV/UV at the H Lyman-alpha 121.6±4.5 nm line. For the corona it measures at 122.6±3 nm and 700±32 nm. In addition it images the Sun in a UV narrow-band continuum (360±2.0 nm) from the disk center to 1.2 solar radii.
Background New development.
Scanning Technique
Coverage / Cycle
Mass Power Data Rate


Providing Agency CAS
Instrument Maturity Flown on operational programme
Utilization Period: 2023 to 2026
Last update: 2022-10-10
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 EUV imager [from L1, GEO, LEO]
  • Solar UV imager [from L1, GEO, LEO]
Mission objectives
Primary mission objectives
  • Solar EUV image
  • Solar white light 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
Solar Lyman-alpha flux1 - primaryNo specific limitation.H-Ly-alpha at 121.6 nm (EUV/UV boundary), corona view included