WMO OSCAR | Details for Instrument SEM/HEPD

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Instrument: SEM/HEPD

Instrument details

Acronym	SEM/HEPD
Full name	Space Environment Monitor - High Energy Particle Detector
Purpose	Space weather - Charged particles at platform level
Short description	Spectrometer for electrons (0.15-5.7 MeV), protons (3-300 MeV) and alpha-particles (12-220 MeV) Calibration monitoring here
Background	Part of the Space Environment Monitor of FY-1 and FY-3 A/B satellites
Scanning Technique	N/A (in-situ in the platform environment)
Resolution	N/A
Coverage / Cycle	N/A
Mass		Power	Data Rate

Providing Agency	CMA
Instrument Maturity	Flown on operational programme
Utilization Period:	1988 to 2025
Last update:	2024-09-09

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

Feng-Yun - 1 (CMA)
- FY-1A (see instrument status) Oct 1988 - Oct 1988
- FY-1B (see instrument status) Dec 1990 - Aug 1991
- FY-1C (see instrument status) Aug 1999 - Apr 2004
- FY-1D (see instrument status) Aug 2002 - Apr 2012
Feng-Yun - 3 (CMA)
- FY-3D (see instrument status) TBD - 2025
- FY-3A (see instrument status) Aug 2008 - Jan 2015
- FY-3B (see instrument status) Feb 2011 - Jun 2020
- FY-3C (see instrument status) 2014 - Feb 2020

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
Alpha-particle sensor at LEO

Mission objectives

Primary mission objectives

Alpha particles differential directional flux
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*	5 - marginal	No specific limitation.	Platform environment, medium and high energy (over 40 to over 400 keV)
Proton differential directional flux*	5 - marginal	No specific limitation.	Platform environment, high energy (over 1000 keV)
Alpha particles differential directional flux*	5 - marginal	No specific limitation.	Platform environment. Low-medium energy range (<10 up to 100 MeV/n)