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Ann. Geophys., 17, 1513-1520, 1999
www.ann-geophys.net/17/1513/1999/
© European Geosciences Union 1999
EDI electron time-of-flight measurements on Equator-S
G. Paschmann1, N. Sckopke1, H. Vaith1, J. M. Quinn2, O. H. Bauer1, W. Baumjohann1, W. Fillius3, G. Haerendel1, S. S. Kerr3, C. A. Kletzing4, K. Lynch2, C. E. McIlwain3, R. B. Torbert2, and E. C. Whipple5
1Max-Planck-Institut für extraterrestrische Physik, D-87545 Garching, Germany
2University of New Hampshire, Durham, NH 03824, USA
3University of California at San Diego, La Jolla, CA 92093, USA
4University of Iowa, Iowa City, IA 52242, USA
5University of Washington, Seattle, WA 98195, USA
Abstract. We present the first electron time-of-flight
measurements obtained with the Electron Drift Instrument (EDI) on Equator-S.
These measurements are made possible by amplitude-modulation and coding of the
emitted electron beams and correlation with the signal from the returning
electrons. The purpose of the time-of-flight measurements is twofold. First,
they provide the drift velocity, and thus the electric field, when the distance
the electrons drift in a gyro period becomes sufficiently large. Second, they
provide the gyro time of the electrons emitted by the instrument, and thus the
magnitude of the ambient magnetic field, allowing in-flight calibration of the
flux-gate magnetometer with high precision. Results of both applications are
discussed.
Key words. Magnetospheric physics (electric fields;
plasma convection; instruments and techniques)
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