The THEMIS Mission 2009
DOI: 10.1007/978-0-387-89820-9_14
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The Electric Field Instrument (EFI) for THEMIS

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Cited by 181 publications
(198 citation statements)
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“…The THEMIS spacecraft are well equipped for measurement of electric fields near the plane of the ecliptic, with spinning 50 and 40 m baselines, and less so perpendicular to it, with only a 6.9 m baseline along the spin axis (Bonnell et al, 2008). We have used the spin-plane measurements with offsets negligible compared to the size of the signal, and determined the axial signal (roughly GSM E Z ) from them by requiring that E · B = 0.…”
Section: Electric Field Observationsmentioning
confidence: 99%
“…The THEMIS spacecraft are well equipped for measurement of electric fields near the plane of the ecliptic, with spinning 50 and 40 m baselines, and less so perpendicular to it, with only a 6.9 m baseline along the spin axis (Bonnell et al, 2008). We have used the spin-plane measurements with offsets negligible compared to the size of the signal, and determined the axial signal (roughly GSM E Z ) from them by requiring that E · B = 0.…”
Section: Electric Field Observationsmentioning
confidence: 99%
“…In the magnetospheric plasma, where binary collisions are almost absent, plasma waves are expected to ensure the collisionless dissipation requested by some of the substorm models, and, for guided waves, to allow a remote sensing of the dynamics of active regions. The Electric Field Instrument (EFI, see Bonnell et al 2008 for more details) and the Search Coil Magnetometer (SCM) instruments on THEMIS are tailored to investigating the possible role played by waves at substorm breakup and during the expansion phase. THEMIS SCM has a long heritage; earlier versions of the instrument have been built for GEOS 1 and 2, Ulysses, Galileo, Interball, and more recently for Cluster, and Cassini.…”
mentioning
confidence: 99%
“…In this case, all five IDPUs and FGMs were powered on and checked out during five consecutive passes, spanning 6 hours total. This approach worked very well as on-console staffing could be optimized and the operations and engineering support teams concentrated on one set of procedures at a The first probe to deploy its EFI spin-plane and axial booms was THEMIS C, beginning on LD+81 (Bonnell et al 2008). Detailed analyses showed that reeling out a section of the wire booms followed by a pulsed spin-up maneuver with two short pulses per spin revolution would not compromise dynamic stability (Auslander et al 2008).…”
Section: Instrument Commissioningmentioning
confidence: 97%