THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
Measurements > Gravity and Magnetic Fields >
Gravity, Magnetic and Geodynamic measurements >
Ion Density, Drift Velocity, and Temperature


Measurement Definition*: An instrument that measures the amount of ions encountered by the spacecraft, and attempts to deflect them to assess their velocity and temperature.
InstrumentStatus/
Accuracy
Instrument DescriptionMeasurement TechnologyTimeline
IRM
Imaging and Rapid-scanning ion Mass spectrometer
Operational
Measures the composition and 3-dimensional velocity distributions of ions.n/a
IVM
Ion Velocity Meter
Operational
Measures the in-situ plasma density, ion temperature and composition, and drift velocity. Used for modeling the ionosphere to determine electric fields that could impact other systems (e.g. GPS radio signals).n/a
SEP
Space Environment Monitoring Instrument Package
Operational
A suite that contains energetic particle detectors, magnetometer, and space weather impact detectors, among which, the energetic particle detectors measure high energy protons (0.4~4MeV) and high energy electrons (1~165MeV, and >165MeV) with two probes. Particle flux detection is performed in multiple directions with a number of probes mounted toward different orientation on the three-axis stabilized spacecraft. The space weather impact detectors measure radiation dosage, electrification at the surface and deep inside the spacecraft. It’s the first time China put space weather impact and space environment detectors on the same geostationary platform.n/a
SSI/ES-2
Special Sensor Ionospheric Plasma Drift/Scintillation Meter
Operational
Measurement of the ambient electron density and temperatures, the ambient ion density, and ion temperature and molecular weight.n/a
SSULI
Special Sensor Ultraviolet Limb Imager
Operational
Measures vertical profiles of the natural airglow radiation from atoms, molecules and ions in the upper atmosphere and ionosphere.n/a
SSUSI
Special Sensor Ultraviolet Spectrographic Imager
Operational
Monitors the composition and structure of the upper atmosphere and ionosphere, as well as auroral energetic particle inputs, with spectrographic imaging and photometry.n/a
STIS
Supra Thermal Ion Sensor
Proposed
 n/a
* Description adapted from WMO.
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