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

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

Evaluation of Measurements

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)