BackForwardInstrument:  SME (SUM) 

Instrument details
Acronym SME (SUM)
Full name SME - Solar UV Monitor
Purpose The objective of the Ultraviolet Solar Monitor Experiment was to monitor the incoming solar radiation to determine the effect on the ozone concentration.
Short description A dual-channel Ebert-Fastie spectrometer measured solar radiation at 1216 Angstrom and between 1600 and 3100 A with a resolution of 1 A. The look direction was 45 deg to the spacecraft axis of rotation.
Background Part of the NASA space weather measurement programme.
Scanning Technique N/A
Coverage / Cycle In the 3 am to 3 pm sun-synchronous orbit, the instrument scanned through the sun once per orbit.
Mass Power Data Rate


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1981 to 1989
Last update: 2023-05-15
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
  • Space radiometer or spectrometer
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 EUV spectrometer [from L1, GEO, LEO]
Mission objectives
No mission objectives have been defined.
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.