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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 9 | Copyright
Ann. Geophys., 27, 3577-3590, 2009
https://doi.org/10.5194/angeo-27-3577-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Sep 2009

28 Sep 2009

Plasma transport in the magnetotail lobes

S. Haaland1,2, B. Lybekk3, K. Svenes4, A. Pedersen3, M. Förster5, H. Vaith6, and R. Torbert6 S. Haaland et al.
  • 1Max-Planck Institute for Solar Systems, Germany
  • 2Department of Physics and Technology, University of Bergen, Norway
  • 3Department of Physics, University of Oslo, Norway
  • 4Norwegian Defence Research Establishment, Norway
  • 5Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Germany
  • 6University of New Hamshire, NH, USA

Abstract. The Earth's magnetosphere is populated by particles originating from the solar wind and the terrestrial ionosphere. A substantial fraction of the plasma from these sources are convected through the magnetotail lobes. In this paper, we present a statistical study of convective plasma transport through the Earth's magnetotail lobes for various geomagnetic conditions. The results are based on a combination of density measurements from the Electric Field and Waves Experiment (EFW) and convection velocities from the Electron Drift Instrument (EDI) on board the Cluster spacecraft. The results show that variations in the plasma flow is primarily attributed to changes in the convection velocity, whereas the plasma density remains fairly constant and shows little correlation with geomagnetic activity. During disturbed conditions there is also an increased abundance of heavier ions, which combined with enhanced convection, cause an accentuation of the mass flow. The convective transport is much slower than the field aligned transport. A substantial amount of plasma therefore escape downtail without ever reaching the central plasma sheet.

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