BackForwardInstrument:  EVE 

Instrument details
Acronym EVE
Full name EUV Variability Experiment
Purpose To measure the solar extreme ultraviolet (EUV) irradiance with unprecedented spectral resolution, temporal cadence, accuracy, and precision
Short description Set of grating spectroradiometers covering the range 0.1-122 nm, including Fe-IX at 17.1 nm, Fe-XII at 19.5 nm, Fe-XV at 28.4 nm, He-II at 30.4 nm, and H-Lyman-alpha at 121.6 nm
Background Part of a package of instruments to monitor solar activity
Scanning Technique Sun pointing from a geosynchronous (inclined) orbit
Resolution N/A (full disk)
Coverage / Cycle Full solar disk at 10 s intervals
Mass 54 kg Power 47 W Data Rate 7 Mbps


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2010-05-14 to ≥2021
Last update: 2017-05-19
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 No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives
  • Solar EUV flux spectrum
  • Solar Lyman-alpha flux
Show allShow fewer
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 EUV flux spectrum1 - primaryNo specific limitation.High spectral resolution, wide dynamic range
Solar Lyman-alpha flux2 - very highNo specific limitation.H-Ly-alpha at 121.6 nm (EUV/UV boundary)