| Acronym | Definition |
| CAS | Short for CASSIOPE |
| CASSIOPE | Cascade SmallSat IOnospheric Polar Explorer |
| CCD | Charged Coupled Device |
| CDF | Common Data Format |
| CDH | Command and Data Handling unit |
| CER | Short for CERTO |
| CERTO | Coherent Electromagnetic Radio Tomography |
| CP | Circular Polarization |
| CRF | Celestial Reference Frame |
| CTP | Conventional Terrestrial Pole |
| CX | CASCADE Technology Demonstration Mission |
| ECEF | Earth Centric Earth Fixed |
| eDEx | e-POP Data Explorer |
| e-POP | Enhanced Polar Outflow Probe |
| ESA | European Space Agency |
| eSOC | e-POP Science Operations Center |
| FAI | Fast Auroral Imager |
| GAP | GPS Attitude and Profiling |
| GEI | Geocentric Equatorial Inertial |
| GPS | Global Positioning System |
| GTRF | Galileo Terrestrial Reference Frame |
| HAARP | High-frequency Active Auroral Research Program |
| HDF | Hierarchical Data Format |
| IAU | International Astronomical Union |
| ICRF | International Celestial Reference Frame |
| ICRS | International Celestial Reference System |
| IERS | International Earth Rotation and Reference Systems Service |
| IGRF | International Geomagnetic Reference Frame |
| IRM | Imaging and Rapid-scanning ion Mass spectrometer |
| ISTP | International Solar-Terrestrial Physics |
| ITRF | International Terrestrial Reference Frame |
| LOS | Line of Sight / Loss of Signal |
| LP | Linear Polarization |
| MAG A | Magnetometer A |
| MAG B | Magnetometer B |
| MET | Mission Elapsed Time |
| MGF | Magnetic Field Instrument |
| MLT | Magnetic Local Time |
| MOS | Mission Operations System |
| NGS | National Geodetic Survey |
| NIR | Near infrared |
| NMS | Neutral Mass and velocity Spectrometer |
| PDM | Power Distribution Module |
| QL | Quicklook |
| RINEX | Receiver Independent Exchange Format |
| RRI | Radio Receiver Instrument |
| Rx | Receiver |
| SEI | Suprathermal Electron Imager |
| SP3 | Standard Product 3 |
| SSA | Star Sensor A |
| SSB | Star Sensor B |
| SSC | Sensor Surface Current / Swedish Space Corporation |
| Swarm-E | A.k.a. CASSIOPE/e-POP |
| TEC | Total Electron Content |
| TRF | Terrestrial Reference Frame |
| TRS | Terrestrial Reference System |
| Tx | Transmitter |
| UHF | Ultra High Frequency |
| UTC | Coordinated Universal Time |
| VHF | Very High Frequency |
| VSA | Voltage on the Spherical Analyzer |
| WGS | World Geodetic System |
