Instrument: EFW : Electric Field and Wave Experiment
	Instrument Category: Solar/Space Observing Instruments Instrument Class: Magnetic Field/Electric Field Instruments

Associated Platforms CLUSTER-II Related Data Sets View all records related to this instrument Description The EFW instrument (Electric Field and Waves) [Gustafsson et al., 1997, 2001] on Cluster-II is part of the Wave Experiment Consortium (WEC). It consists of four 8 cm diameter spherical probes extended on 42.5 m long wire booms (88 m tip-tip) in the spacecraft spin plane. The probes are used for measuring either electric fields or plasma density variations. In the electric field mode, the probes are actively controlled by a bias current to ensure a high quality measurement. In the density mode, the probes are voltage biased to collect the ambient thermal electron current. Analog signals from the EFW instrument are fed to STAFF, WHISPER and WBD. Commands to EFW and telemetry from EFW are passed through DWP. In addition, EFW receives (via DWP) signals from FGM and STAFF, and delivers (via DWP) the measured spacecraft potential to ASPOC. See: http://cluster.irfu.se/ Online Resources http://cluster.irfu.se/ Instrument Logistics Data Rate: 1.44 kbps Instrument Start Date: 2000-07-16 Instrument Owner: IRF, Sweden