| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Gravity and Magnetic Fields >
Gravity, Magnetic and Geodynamic measurements >
Auroral Emissions
  | Measurement Definition*: A highly sensitive camera that collects photons radiated by auroral processes. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
FAI
Fast Auroral Imager | Operational
| Measures the large-scale auroral emissions in the 630-1100 nm wavelength range. The FAI imager system produces 16-bit digital images of the near infrared band at one image per second (CASSIOPE is a 3-axis stabilized platform),and the 630-nm wavelength at two images per minute, giving adequate temporal resolution to investigate the above scientific objectives. | 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 | |
WAI
Wide-field Auroral Imager | Operational
| The aurora intensity and form reflect the geomagnetic activity, dynamic feature of high-energy particles in the polar region, and coupling of solar wind with ionosphere. | n/a | |
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* Description adapted from WMO.
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