BackForwardInstrument:  GGAK-E/VUSS-E 

Instrument details
Full name GGAK-E / Solar UV radiation sensor
Purpose To measure the intensity of the solar UV radiation
Short description Fluxmeter to measure the intensity at 121.6 nm (H Lyman alpha-line)
Background Part of the GGAK-E (Heliogeophysical Instrument Complex on Electro-L) package, also confirmed for Electro-M (GGAK-E/M) and adapted to Arctica (GGAK-E/A)
Scanning Technique Sun pointing from GEO
Resolution N/A (full disk)
Coverage / Cycle Full solar disk at 1 s intervals
Mass Power Data Rate


Providing Agency Roscosmos
Instrument Maturity Flown on operational programme
Utilization Period: 2012-01-15 to ≥2039
Last update: 2016-07-05
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 Lyman-alpha 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 Lyman-alpha flux2 - very highNo specific limitation.H-Ly-alpha at 121.6 nm (EUV/UV boundary)