Magnetic Field/Electric Field Instruments
EFW
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/ Group: Instrument_Details Entry_ID: EFW Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: Magnetic Field/Electric Field Instruments Short_Name: EFW Long_Name: Electric Field and Wave Experiment End_Group Group: Associated_Platforms Short_Name: CLUSTER-II End_Group Online_Resource: http://cluster.irfu.se/ Sample_Image: http://sci.esa.int/science-e-media/img/33/hires_36659.JPG Group: Instrument_Logistics Data_Rate: 1.44 kbps Instrument_Start_Date: 2000-07-16 Instrument_Owner: IRF, Sweden End_Group End_Group