BackForwardInstrument:  GGAK-E/ISP-2M 

Instrument details
Acronym GGAK-E/ISP-2M
Full name GGAK-L / Solar constant sensor
Purpose Integral radiance of the Sun (integral solar constant)
Short description Spectral range. 0.2-100 µm
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
Resolution N/A
Coverage / Cycle Continuous measuremet (at 1 s intervals)
Mass Power Data Rate


Providing Agency Roscosmos
Instrument Maturity Flown on operational programme
Utilization Period: ≥2023 to ≥2033
Last update: 2021-06-23
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
  • Earth observation instrument
  • Passive optical radiometer or spectrometer
  • Solar irradiance monitor
WIGOS Subcomponents
  • Subcomponent 1
  • TSI and SSI radiometers (for solar irradiance)
Mission objectives
Primary mission objectives
  • Downward short-wave irradiance at TOA
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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
Downward short-wave irradiance at TOA2 - very highNo specific limitation.TSI over the range from UV to FIR