WMO OSCAR | Details for Instrument SEM/XRS-EUV

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Instrument: SEM/XRS-EUV

Instrument details

Acronym	SEM/XRS-EUV
Full name	SEM / X-Ray Sensor - Extreme Ultra-Violet Sensor
Purpose	To measure disk-integrated solar X-ray and EUV fluxes
Short description	Assemblage of two channels in the X-ray ranges 0.05-0.3 nm and 0.1-0.8 nm; and five channels in the EUV ranges around 10 nm, 30 nm, 60 nm, 80 nm and 126 nm [including Fe-XV at 28.4 nm, He-II at 30.4 nm and H-Lyman-alpha at 121.6 nm]
Background	Part of the SEM (Space Environment Monitor) package
Scanning Technique	Sun pointing from GEO
Resolution	N/A (full disk)
Coverage / Cycle	Full solar disk at 2 s intervals (X-ray) and 33 s (EUV)
Mass		Power	Data Rate

Providing Agency	NOAA
Instrument Maturity	Flown on operational programme
Utilization Period:	1974 to 2022
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

Geostationary Operational Environmental Satellite - 1st generation (NOAA)
- GOES-1 (see instrument status) Oct 1975 - Mar 1985
- GOES-2 (see instrument status) Jun 1977 - Jul 1993
- GOES-3 (see instrument status) Jun 1978 - Jul 1993
- GOES-4 (see instrument status) Sep 1980 - Nov 1988
- GOES-5 (see instrument status) May 1981 - Jul 1990
- GOES-6 (see instrument status) Apr 1983 - Jul 1989
- GOES-7 (see instrument status) Feb 1987 - Jan 1996
Geostationary Operational Environmental Satellite - 2nd generation (NOAA)
- GOES-8 (see instrument status) Apr 1994 - May 2004
- GOES-9 (see instrument status) May 1995 - May 2003
- GOES-10 (see instrument status) Apr 1997 - Dec 2006
- GOES-11 (see instrument status) May 2000 - Dec 2011
- GOES-12 (see instrument status) Jul 2001 - May 2010
- GOES-9 (GMS backup) (see instrument status) May 2003 - Jul 2006
- GOES-13 (see instrument status) May 2006 - Oct 2019
- GOES-10 (S-America) (see instrument status) Dec 2006 - Dec 2009
- GOES-14 (see instrument status) Jun 2009 - 2022
- GOES-15 (see instrument status) Mar 2010 - 2022
Synchronous Meteorological Satellite (NASA)
- SMS-1 (see instrument status) May 1974 - Jan 1981
- SMS-2 (see instrument status) Feb 1975 - Aug 1982

Instrument classification

Solar and space environment monitors
Solar activity monitor

WIGOS Subcomponents

Subcomponent 1
X-ray spectrograph on GEO orbit
X-ray spectrometer at GEO
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 X-ray spectrometer [from L1, GEO, LEO]
Solar EUV spectrometer [from L1, GEO, LEO]
Subcomponent 3
UV spectral imagery (e.g. GEO, HEO, MEO, LEO)
X-ray spectrometer [from GEO, HEO, MEO, LEO]
EUV spectrometer [from GEO, HEO, MEO, LEO]

Mission objectives

Primary mission objectives

Solar EUV flux
Solar X-ray flux

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
Note: * Primary mission objective.

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