| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Gravity and Magnetic Fields >
Gravity, Magnetic and Geodynamic measurements >
Magnetic field (vector)
  | Measurement Definition*: [Unit of measurement - n tesla] |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
GGAK-E
Module for Geophysical Measurements | Operational
| Monitoring and forecasting of solar activity, radiation and magnetic field in the near-Earth space, monitoring of natural and modified magnetosphere, ionosphere and upper atmosphere. | n/a |  |
GGAK-M
Module for Geophysical Measurements (SEM) | Operational
| Space Environmental Monitoring (SEM), heliogeophysical. | n/a | |
GGAK-VE
Module for Geophysical Measurements | Operational
| Monitoring and forecasting of solar activity, radiation and magnetic field in the near-Earth space, monitoring of natural and modified magnetosphere, ionosphere and upper atmosphere. | n/a | |
Magnetometer (GOES)
Magnetometer (GOES) | Operational
| | n/a | |
MGF
MaGnetic Field instrument | Operational
+/-0.06 nT | The MGF consists of dual, tri-axial fluxgate magnetometers mounted on an 80-cm carbon fibre boom for measurements of magnetic field perturbations to a precision of 0.0625 nanotesla, from which to infer small-scale field-aligned currents. The MGF is turned on an average of 20% of the time, following a schedule devised by the science team. | n/a | |
PlasMag
Plasma-Magnetometer | Operational
| Magnetometer and plasma sensor to measure solar wind properties for forecasting geomagnetic storms. The Plasma-mag instrument comprises a Faraday Cup (measures solar wind) and a Fluxgate Magnetometer, as well as two space weather instruments: the Electron Spectrometer and the Pulse Height Analyzer. | n/a | |
SSJ/5
Special Sensor Precipitating Plasma Monitor | Operational
| Measurement of transfer energy, mass, and momentum of charged particles through the magnetosphere-ionosphere in the Earth's magnetic field. | n/a | |
SSM
Special Sensor Magnetometer | Operational
| Measures geomagnetic fluctuations associated with solar geophysical phenomena. With SSIES and SSJ provides heating and electron density profiles in the ionosphere. | n/a | |
STR
Star Tracker Set (3) | Operational
| Precise attitude determination from the combination of two or three star trackers. | n/a | |
VFM
Vector Field Magnetometer | Operational
| Magnetic field vector measurements. | n/a | |
Advanced GGAK-M
Advanced Module for Geophysical Measurements (SEM) | Proposed
| Space Environmental Monitoring (SEM). | n/a | |
Magnetometer
Magnetometer (heliospheric magnetic field) | Proposed
| | n/a | |
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* Description adapted from WMO.
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