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

Document Type

Article

Journal/Book Title/Conference

Annales Geophysicae

Volume

28

Publisher

European Geosciences Union

Publication Date

2010

First Page

2097

Last Page

2101

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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