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Instrument details
Acronym
SSIM
Full name
Solar Spectral Irradiance Monitor
Purpose
Spectral solar irradiance in UV/VIS/NIR/SWIR
Short description
Prism spectrometer for spectral irradiance: range 165-1650 nm, split in three bands: 165-320 nm (resolution 1 nm), 285-700 nm (resolution 1 nm) and 650-1650 nm (resolution 8 nm). Absolute accuracy: 3% from 165 to 240 nm and 2% from 240 to 1650 nm.
Background
New development
Scanning Technique
Sun pointing during orbital movement, data sampled every 2 min
Resolution
N/A
Coverage / Cycle
One measurement after integration of all data taken during the orbit; thus 100 min
Mass
Power
Data Rate
Providing Agency
CMA
Instrument Maturity
Flown on operational programme
Utilization Period:
≥2021 to ≥2026
Last update:
2021-06-15
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
Earth observation instrument Passive optical radiometer or spectrometer Solar irradiance monitor
WIGOS Subcomponents
Subcomponent 1 Absolutely calibrated broadband radiometers, and TSI and SSI radiometers
Mission objectives
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
Variable Relevance for measuring this variable Operational limitations Explanation
Downward short-wave irradiance at TOA 5 - marginal No specific limitation. Spectral irradiance stretching to SWIR
Instrument: SSIM