| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Gravity and Magnetic Fields >
Gravity, Magnetic and Geodynamic measurements >
ULF-HF Electromagnetic Waves
  | Measurement Definition*: Radio receiver instrument, recording the wave received from the ground or other spacecraft, to determine how it was modified by its travel through the ionosphere. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
RRI
Radio Receiver Instrument | Operational
| The RRI measures wave electric fields in the 10Hz - 18MHz range, at magnitudes from 1 µV/m to 1 V/m to study the morphology and dynamics of ionospheric density structures, auroral wave-particle interactions, plasma nonlinear processes created by intense high frequency waves, and the mechanism of coherent wave backscatter. | n/a |  |
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* Description adapted from WMO.
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