Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.585 IF 1.585
  • IF 5-year value: 1.698 IF 5-year
    1.698
  • CiteScore value: 1.62 CiteScore
    1.62
  • SNIP value: 0.820 SNIP 0.820
  • IPP value: 1.52 IPP 1.52
  • SJR value: 0.781 SJR 0.781
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 83 Scimago H
    index 83
  • h5-index value: 24 h5-index 24
Volume 19, issue 10/12
Ann. Geophys., 19, 1669–1681, 2001
https://doi.org/10.5194/angeo-19-1669-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: CLUSTER

Ann. Geophys., 19, 1669–1681, 2001
https://doi.org/10.5194/angeo-19-1669-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Sep 2001

30 Sep 2001

Cluster EDI convection measurements across the high-latitude plasma sheet boundary at midnight

J. M. Quinn1, G. Paschmann2, R. B. Torbert1, H. Vaith2, C. E. McIlwain3, G. Haerendel4, O. Bauer2, T. M. Bauer2, W. Baumjohann5, W. Fillius3, M. Foerster2, S. Frey2, E. Georgescu2, S. S. Kerr3, C. A. Kletzing6, H. Matsui1, P. Puhl-Quinn2, and E. C. Whipple7 J. M. Quinn et al.
  • 1Space Science Center, Morse Hall University of New Hampshire Durham, NH 03824, USA
  • 2Max-Planck-Institut für extraterrestrische Physik D-87545 Garching, Germany
  • 3Center for Astrophysics and Space Sciences University of California, San Diego La Jolla, CA 92093, USA
  • 4International University Bremen, 28725 Bremen, Germany
  • 5Space Research Institute, 8042 Graz, Austria
  • 6Department of Physics and Astronomy University of Iowa Iowa City, IO 52242, USA
  • 7Geophysics Program University of Washington Seattle, WA 98195, USA

Abstract. We examine two crossings of three Cluster satellites from the polar cap into the high-latitude plasma sheet at midnight local time, using data from the Electron Drift Instrument (EDI). EDI measures the full electron drift velocity in the plane perpendicular to the magnetic field for any field and drift directions. The context of the measured convection velocities is established by their relation to the intense enhancements in 1 keV electrons, also measured by EDI, as the satellites move from the polar cap into the plasma sheet boundary. In both cases presented here, the cross B convection in the polar cap is anti-sunward (toward the nightside plasma sheet) with a small duskward component. As the satellites enter the plasma sheet boundary region, the dawn-dusk convective flow component reverses its sign, and the flow in the meridianal plane (toward the center of the plasma sheet) drops substantially. The relatively stable convection in the polar cap becomes highly variable as the PSBL is encountered. The timing and sequence of the boundary crossings by the Cluster satellites are consistent with a relatively static structure on a time scale of the few minutes in satellite separations. In one of the two events, the plasma sheet boundary has a spatially separate structure that is crossed by the satellites before entering the plasma sheet.

Key words. Magnetospheric physics (electric fields; magnetopause, cusp and boundary layers; instruments and techniques)

Publications Copernicus
Special issue
Download
Citation