WMO OSCAR | Details for Instrument SEM/TED

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Instrument: SEM/TED

Instrument details

Acronym	SEM/TED
Full name	SEM / Total Energy Detector
Purpose	To measures proton and electron fluxes at platform level
Short description	Eight electrostatic analyzers and pulse height discriminators operating in two ranges: 0.05-1 keV and 1-20 keV, each measurement independently for electrons and protons.
Background	Part of the packages named SEM (Space Environment Monitor) until NOAA-14, and SEM/2 (Space Environment Monitor - 2) from NOAA-15 onward and on MetOp
Scanning Technique	N/A (in-situ measurement in the platform environment)
Resolution	N/A
Coverage / Cycle	N/A
Mass		Power	Data Rate

Providing Agency	NOAA
Instrument Maturity	Flown on operational programme
Utilization Period:	1979 to 2024
Last update:	2021-11-13

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

EUMETSAT Polar System (EUMETSAT)
- Metop-A (see instrument status) Oct 2006 - Nov 2021
- Metop-B (see instrument status) Sep 2012 - 2024
NOAA 4th generation / Polar Operational Environmental Satellites (NOAA)
- NOAA-8 (see instrument status) Mar 1983 - Dec 1985
- NOAA-9 (see instrument status) Dec 1984 - Feb 1998
- NOAA-10 (see instrument status) Sep 1986 - Aug 2001
- NOAA-12 (see instrument status) May 1991 - Aug 2007
- NOAA-13 (see instrument status) Aug 1993 - Aug 1993
- NOAA-14 (see instrument status) Dec 1994 - May 2007
NOAA 5th generation / Polar Operational Environmental Satellites (NOAA)
- NOAA-15 (see instrument status) May 1998 - 2023
- NOAA-16 (see instrument status) Sep 2000 - Jun 2014
- NOAA-17 (see instrument status) Jun 2002 - Apr 2013
- NOAA-18 (see instrument status) May 2005 - 2022
- NOAA-19 (see instrument status) Feb 2009 - 2022
National Oceanic and Atmospheric Administration - 4th generation (NOAA)
- TIROS-N (see instrument status) Oct 1978 - Feb 1981
- NOAA-6 (see instrument status) Jun 1979 - Mar 1987
- NOAA-7 (see instrument status) Jun 1981 - Jun 1986

Instrument classification

Solar and space environment monitors
Energetic particle spectrometer

WIGOS Subcomponents

Subcomponent 1
In-situ plasma probes, and energetic particle spectrometers and magnetometers at GEO and LEO, and magnetic field at GEO
Electron sensor at LEO
Proton sensor at LEO
Plasma density sensor at LEO
Plasma temperature sensor at LEO
Plasma velocity sensor at LEO

Mission objectives

Primary mission objectives

Electron differential directional flux
Proton differential directional 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
Electron differential directional flux*	4 - fair	No specific limitation.	Sun pointing, low energy (up to 40 keV)
Proton differential directional flux*	4 - fair	No specific limitation.	Sun pointing, low energy (up to 40 keV)
Solar wind density	2 - very high	No specific limitation.	Solar viewing. Inferred by elecron and proton spectroscopy
Solar wind temperature	2 - very high	No specific limitation.	Solar viewing. Inferred by elecron and proton spectroscopy
Solar wind velocity	2 - very high	No specific limitation.	Solar viewing. Inferred by elecron and proton spectroscopy