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Volume 29, issue 1
Ann. Geophys., 29, 181–186, 2011
https://doi.org/10.5194/angeo-29-181-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 181–186, 2011
https://doi.org/10.5194/angeo-29-181-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 21 Jan 2011

ANGEO Communicates | 21 Jan 2011

Thermospheric vorticity at high geomagnetic latitudes from CHAMP data and its IMF dependence

M. Förster1, S. E. Haaland2,3, and E. Doornbos4 M. Förster et al.
  • 1GFZ German Research Centre for Geosciences, Helmholtz Centre Potsdam, Germany
  • 2Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
  • 3Department of Physics and Technology, University of Bergen, Norway
  • 4Delft Institute for Earth Observation and Space Systems (DEOS), Delft, The Netherlands

Abstract. Neutral thermospheric wind pattern at high latitudes obtained from cross-track acceleration measurements of the CHAMP satellite above both polar regions are used to deduce statistical neutral wind vorticity distributions and were analyzed in their dependence on the Interplanetary Magnetic Field (IMF). The average pattern confirms the large duskside anticyclonic vortex seen in the average wind pattern and reveals a cyclonic vorticity on the dawnside, which is almost equal in magnitude to the duskside minimum. The outer shape of the vorticity pattern agrees approximately with the outer boundary of region-1 currents in the well-known average current distributions of Iijima and Potemra (1976) The IMF dependence of the vorticity pattern resembles the characteristic FAC and ionospheric plasma drift pattern known from various statistical studies obtained under the same sorting conditions.

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