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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 11
Ann. Geophys., 28, 2097–2101, 2010
https://doi.org/10.5194/angeo-28-2097-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 2097–2101, 2010
https://doi.org/10.5194/angeo-28-2097-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 12 Nov 2010

ANGEO Communicates | 12 Nov 2010

Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift

J. Park1,2, H. Lühr1, B. G. Fejer3, and K. W. Min2 J. Park et al.
  • 1GFZ, German Research Center for Geosciences, Germany
  • 2Department of Physics, Korea Advanced Institute of Science and Technology, Korea
  • 3Center for Atmospheric and Space Science, Utah State University, USA

Abstract. From magnetic field observations by CHAMP we estimate F-region dynamo current densities near the sunset terminator during solar maximum years from 2001 to 2002. The dynamo currents are compared with the pre-reversal enhancement (PRE) of vertical plasma drift as observed by ROCSAT-1. The seasonal-longitudinal variation of PRE can be largely related to the F-region dynamo current density, with the correlation coefficient reaching 0.74. The correlation can be further improved if we consider a zonal gradient of the E-region Pedersen conductivity, which also depends on season and longitude. It is widely accepted that the F-region dynamo drives PRE near sunset. For the first time, our observations provide confirmation for the close relationship between the F-region dynamo current density and PRE.

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