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Swarm is an Earth-Observing-class satellite mission approved in 2004 by the European Space Agency for full development and launch in 2011. Swarm’s three satellites will measure the geomagnetic field with unprecedented precision for four years beginning in 2011. Swarm follows previous high-precision geomagnetic missions such as Magsat, Oersted, and CHAMP, but will also measure electric fields, which can be used to characterize and subtract magnetic “noise” originating in the magnetosphere and ionosphere. On Swarm, E-fields will be measured via ion drift v through the relation E = -vxB. The Swarm "Canadian Electric Field Instruments" are being built by COM DEV, Ltd of Cambridge, ON under contract from ESA. ISIS Space Phsyics is the lead science group for these instruments.

ESA Swarm Website