BackForwardInstrument:  STEK 

Instrument details
Acronym STEK
Full name Telescope-coronagraph
Purpose To measure solar UV and VIS radiation
Short description Description not available. Imaging fluxmeter operating presumably in the UV range 200-350 nm and the VIS range 427-630 nm
Background Part of the instrument package carried by the Zond satellite of the 5-satellite Ionozonde constellation
Scanning Technique Sun pointing from a LEO drifting orbit. Corona view included
Resolution Presumably 1500 km at Sun surface
Coverage / Cycle Full Sun disk in about 10 s
Mass Power Data Rate

 

Providing Agency Roscosmos
Instrument Maturity Flown on an R&D satellite
Utilization Period: ≥2025-02 to ≥2028
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 UV spectrometer [from L1, GEO, LEO]
  • Solar UV imager [from L1, GEO, LEO]
  • Solar VIS spectrometer [from L1, GEO, LEO]
  • Solar VIS imager [from L1, GEO, LEO]
  • Solar coronagraph and heliospheric imagery both on the Earth-Sun line and off the Earth-Sun line (e.g. L5 point)
  • Solar coronographic imager [from L1, GEO, LEO]
  • Subcomponent 3
  • UV spectral imagery (e.g. GEO, HEO, MEO, LEO)
  • UV spectral imager [from GEO, HEO, MEO, LEO]
  • VIS spectral imager [from GEO, HEO, MEO, LEO]
Mission objectives
Primary mission objectives
  • Solar UV flux
  • Solar UV image
  • Solar VIS flux
  • Solar VIS 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 UV flux*4 - fairNo specific limitation.Few channels, moderate dynamic range, corona view included
Solar UV image*3 - highNo specific limitation.Fluxmetry with high spatial resolution, corona view included
Solar VIS flux*3 - highNo specific limitation.Wide dynamic range, corona view included
Solar VIS image*3 - highNo specific limitation.Fluxmetry with high spatial resolution, corona view included
Solar white light image3 - highNo specific limitation.Fluxmetry with high spatial resolution, good coverage of the VIS range, corona view included
Solar coronagraphic image4 - fairNo specific limitation.UV (121.6-393.4 nm)