BackForwardInstrument:  ES 

Instrument details
Acronym ES
Full name Electron Spectrometer
Purpose Spectrometry of the electrons of the solar wind
Short description Tophat electrostatic analyzer measuring the electron distribution function between 3 eV and 2 keV
Background DSCOVR is the refurbishment of the Triana satellite stored on the ground in 2000 [named after Rodrigo de Triana, the first of Columbus's crew to sight land in the Americas
Scanning Technique Interplanetary space from the L1 Lagrange libration point
Resolution N/A
Coverage / Cycle Full interplanetary space, nearly continuous
Mass Power Data Rate


Providing Agency NASA
Instrument Maturity Backed by strong heritage
Utilization Period: 2015-05-28 to ≥2026
Last update: 2021-10-02
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
  • Energetic particle spectrometer
WIGOS Subcomponents
  • Subcomponent 1
  • Solar wind at L1 - Electron sensor
Mission objectives
Secondary mission objectives
  • Electron differential directional 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
Electron differential directional flux3 - highNo specific limitation.Interplanetary space, low energy (up to 40 keV)