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Instrument details
Acronym
EXIS
Full name
Extreme Ultraviolet Sensor / X-Ray Sensor Irradiance Sensors
Purpose
To monitor EUV and X-rays from the solar disk
Short description
Two units: EUVS (EUV Sensor) and XRS (X-Ray Sensor). EUVS measures EUV flux in 5 channels of the 5-127 nm range [including Fe-XV at 28.4 nm, He-II at 30.4 nm and H-Lyman-alpha at 121.6 nm]. XRS measures soft-X-rays fluxes in two bands, 0.05-0.4 and 0.1-0.8 nm
Background
Evolution of SXI on GOES 12 to 15
Scanning Technique
Sun pointing from GEO
Resolution
N/A (full disk)
Coverage / Cycle
Full disc at 2 s intervals (X-ray) and 33 s (EUV)
Mass
30 kg
Power
40 W
Data Rate
7.2 kbps
Providing Agency
NOAA
Instrument Maturity
Backed by strong heritage
Utilization Period:
2017-12-18 to ≥2027
Last update:
2021-12-16
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
Subcomponent 1 X-ray spectrometer at GEO Subcomponent 2 Solar X-ray spectrometer [from L1, GEO, LEO] Solar EUV spectrometer [from L1, GEO, LEO] Subcomponent 3 X-ray spectrometer [from GEO, HEO, MEO, LEO] EUV spectrometer [from GEO, HEO, MEO, LEO]
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
Solar X-ray flux 3 - high No specific limitation. Few channels, wide dynamic range
Solar EUV flux 1 - primary No specific limitation. Several channels, wide dynamic range
Instrument: EXIS