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  Results of the Electron Drift Instrument on Cluster

Paschmann, G., Quinn, J. M., Torbert, R. B., McIlwain, C. E., Vaith, H., Haaland, S., et al. (2021). Results of the Electron Drift Instrument on Cluster. Journal of Geophysical Research: Space Physics, 126(6): e2021JA029313. doi:10.1029/2021JA029313.

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 Creators:
Paschmann, G., Author
Quinn, J. M., Author
Torbert, R. B., Author
McIlwain, C. E., Author
Vaith, H., Author
Haaland, Stein1, Author              
Matsui, H., Author
Kletzing, C. A., Author
Baumjohann, W., Author
Haerendel, G., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_PROJECTS: Cluster
 Abstract: The electron drift instrument (EDI) on Cluster pioneered a new method of measuring electric fields, using a beam of electrons to sample the drift velocity over a km-scale gyro orbit. The technique is especially well suited to measuring weak, sub-mV/m, convection fields due to its sensitivity (to both components in the plane perpendicular to B) and because it is unaffected by the anomalous local electric fields that are generated by spacecraft-plasma interactions. Because EDI requires exquisite beam pointing with active tracking of the firing directions, measurements are less regular, or even impossible, in rapidly varying electric and magnetic fields; however, in the many regimes where tracking is successful the resulting measurements are reliably accurate. We review the EDI technique and instrumentation, and present six areas of investigation using Cluster data: (1) Detailed comparisons of EDI data with the electric field and waves double probe measurements show excellent agreement in many cases but identify large discrepancies where strong ion outflow in the polar regions creates local spacecraft wake effects. (2) The wake effect is exploited to infer quantitative ion outflow rates. Detailed convection patterns in the (3) polar cap, (4) lobe, and (5) inner magnetosphere are derived under various driver conditions using statistical analyses of long term measurements during the Cluster mission. (6) EDI's large geometric-factor detector is used for extremely high time resolution measurements of electrons at a specified energy and pitch angle.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2021JA029313
 Degree: -

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Title: Journal of Geophysical Research: Space Physics
  Other : JGR-A
  Abbreviation : J. Geophys. Res. - A
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 126 (6) Sequence Number: e2021JA029313 Start / End Page: - Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264