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Swarm is a European Space Agency Mission dedicated to studying Earth’s magnetic field by making high-precision and high-resolution measurements of the strength of the magnetic field and the magnetic field vector with high spatial and temporal resolution to examine variations of the field.

Swarm will also provide precise navigation, accelerometer and electric field measurements & data for modeling the geomagnetic field and its interactions in the near-Earth space environment.

The Swarm mission consists of three spacecraft that orbit the Earth in slightly different polar orbits – two fly in a 450-Kilometer orbit and the third in a 530-Kilometer orbit with a different inclination. Each of the spacecraft carries five instruments: a Vector Field Magnetometer, an Absolute Scalar Magnetometer, an Electric Field Instrument, Accelerometers and a Laser Range Reflector. The three spacecraft will operate for at least four years in orbit.