2.3.1 spase://CNES/Instrument/CDPP-AMDA/SWARM-A/TII EFI / TII Electric Field Instrument : Thermal Ion Imager 2016-11-04T15:37:46Z The Electric Field Instrument determines the ion density, the ion drift velocity, and the electric field at the S/C front panel (in-flight). The instrument consists of two components: the Langmuir Probe (LP) and the Thermal Ion Imager (TII). spase://CNES/Person/D.Knudsen PrincipalInvestigator spase://CNES/Person/Johnathan.Burchill Scientist EFI description https://earth.esa.int/web/guest/missions/esa-eo-missions/swarm/instruments/efi Imager 2013-12-02T00:00:00 spase://CNES/Observatory/CDPP-AMDA/SWARM-A