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Instrument details
Acronym
SIM
Full name
Spectral Irradiance Monitor
Purpose
Spectral solar irradiance in UV/VIS/NIR/SWIR
Short description
Prism spectrometer for spectral irradiance: range 0.2-2.4 μm, spectral resolution from 0.25 to 0.33 nm
Background
New development for SORCE, re-flown with improvements on CSIM and part of ISS TSIS 1 and 2
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
22 kg
Power
25.3 W
Data Rate
4.84 kbps
Providing Agency
NASA
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
2003 to 2020-02-25
Last update:
2021-06-23
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 TSI and SSI radiometers (for solar irradiance)
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: SIM