Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift
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...
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2010-11-01
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Series: | Annales Geophysicae |
Online Access: | https://www.ann-geophys.net/28/2097/2010/angeo-28-2097-2010.pdf |
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doaj-f30374ca6b634d6ea8f721d0979e82ab2020-11-25T00:12:07ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762010-11-01282097210110.5194/angeo-28-2097-2010Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma driftJ. Park0J. Park1H. Lühr2B. G. Fejer3K. W. Min4GFZ, German Research Center for Geosciences, GermanyDepartment of Physics, Korea Advanced Institute of Science and Technology, KoreaGFZ, German Research Center for Geosciences, GermanyCenter for Atmospheric and Space Science, Utah State University, USADepartment of Physics, Korea Advanced Institute of Science and Technology, KoreaFrom 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.https://www.ann-geophys.net/28/2097/2010/angeo-28-2097-2010.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J. Park J. Park H. Lühr B. G. Fejer K. W. Min |
spellingShingle |
J. Park J. Park H. Lühr B. G. Fejer K. W. Min Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift Annales Geophysicae |
author_facet |
J. Park J. Park H. Lühr B. G. Fejer K. W. Min |
author_sort |
J. Park |
title |
Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift |
title_short |
Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift |
title_full |
Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift |
title_fullStr |
Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift |
title_full_unstemmed |
Duskside F-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift |
title_sort |
duskside f-region dynamo currents: its relationship with prereversal enhancement of vertical plasma drift |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2010-11-01 |
description |
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. |
url |
https://www.ann-geophys.net/28/2097/2010/angeo-28-2097-2010.pdf |
work_keys_str_mv |
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