All Physics Faculty Publications
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.
Recommended Citation
Park, P., H. Lühr, B. G. Fejer, and K. W. Mim, Duskside F-region dynamo currents: Its relationship with prereversal enhancement of vertical plasma drift, Ann. Geophys., 28, 2097- 2101, 2010.
https://doi.org/10.5194/angeo-28-2097-2010
