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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 12
Ann. Geophys., 17, 1513–1520, 1999
https://doi.org/10.1007/s00585-999-1513-3
© European Geosciences Union 1999

Special issue: Equator S

Ann. Geophys., 17, 1513–1520, 1999
https://doi.org/10.1007/s00585-999-1513-3
© European Geosciences Union 1999

  31 Dec 1999

31 Dec 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 G. Paschmann et al.
  • 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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