Initial Results from the Cluster Electron Drift Instrument

Details Initial Results from the Cluster Electron Drift Instrument Initial Results from the Cluster Electron Drift Instrument

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm21b01q&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM21B-01 INVITED

Physics

2712 Electric Fields (2411), 2730 Magnetosphere--Inner, 2731 Magnetosphere--Outer, 2760 Plasma Convection, 2794 Instruments And Techniques

Scientific paper

We present an overview of initial results from the electron drift instrument (EDI) on the Cluster mission. EDI measures the local electron drift velocity by firing two weak electron-beams perpendicular to the magnetic field, and detecting their return after one or more gyro orbits. Depending on the magnitudes of the drift velocity and magnetic field, the measurement uses either a time-of-flight or "triangulation" technique to deduce the drift velocity. EDI inherently measures both components of the drift velocity in the plane perpendicular to the magnetic field, indpendent of the orientation of the spacecraft spin-axis. The measured drift velocity, from which we deduce the electric field, is usually dominated by the ExB drift. However EDI uses two different beam energies to identify the grad-B contribution to the drift.

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