BackForwardInstrument:  HEL1OS 

Instrument details
Acronym HEL1OS
Full name High Energy L1 Orbiting X-ray Spectrometer
Purpose To observe the dynamic events in the solar corona and provide an estimate of the energy used to accelerate the particles during the eruptive events
Short description X-ray spectrometer for the range 10-150 keV to cover the overlap between thermal and non-thermal components of a solar flare. Spectral resolution presumably around 10
Background New development
Scanning Technique Sun pointing including the corona, with a 3° FOV
Resolution 3° FOV
Coverage / Cycle Continuous from the L1 Lagrange libration point
Mass Power Data Rate


Providing Agency ISRO
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2022 to 2027
Last update: 2021-12-02
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 X-ray spectrometer [from L1, GEO, LEO]
Mission objectives
Primary mission objectives
  • Solar X-ray flux spectrum
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.

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Note: * Primary mission objective.
VariableRelevance for measuring this variableOperational limitationsExplanation
Solar X-ray flux spectrum*3 - highNo specific limitation.Coarse spectral resolution, wide dynamic range, disc and corona view included