BackForwardInstrument:  TSIS 

Instrument details
Acronym TSIS
Full name Total and Spectral Solar Irradiance Sensor
Purpose Total solar irradiance monitoring, and also spectral solar irradiance in UV/VIS/NIR/SWIR
Short description Assemblage of 4 active cavity radiometers for total irradiance (TIM, range 0.2-10 µm), plus a prism spectrometer for spectral irradiance (SIM, range 0.2-2.4 µm, spectral resolution from 2 to 45 nm)
Background Heritage of TIM and SIM flown on SORCE
Scanning Technique Sun pointing during orbital movement, data sampled every 2 min
Resolution N/A
Coverage / Cycle One measurement after integration on all data taken during the diurnal orbit arc; thus 100 min
Mass 30 kg Power 40 W Data Rate 5.4 kbps


Providing Agency NOAA
Instrument Maturity Backed by strong heritage
Utilization Period: ≥2018-03 to ≥2025
Last update: 2017-07-19
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
  • Earth observation instrument
  • Passive optical radiometer or spectrometer
  • Solar irradiance monitor
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 TOA1 - primaryNo specific limitation.Coupled TSI (UV to TIR) and spectral irradiance (VIS to SWIR)