Daily variation at Concordia station (Antarctica) and its dependence on IMF conditions

After some short test surveys, during the 2004–2005 summer expedition in Antarctica, a geomagnetic French-Italian observatory was installed on the plateau (geographic coordinates: 75.1° S, 123.4° E; corrected geomagnetic coordinates: 88.9° S, 54.3° E; UT=LT−8) very close to the geomagnetic pole. In...

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Bibliographic Details
Published in:Annales Geophysicae
Main Authors: L. Cafarella, D. Di Mauro, S. Lepidi, A. Meloni, M. Pietrolungo, L. Santarelli, J. J. Schott
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2007
Subjects:
Science
Q
Physics
QC1-999
Geophysics. Cosmic physics
QC801-809
Concordia Station
Antarc*
Antarctica
Geomagnetic Pole
Online Access:https://doi.org/10.5194/angeo-25-2045-2007
https://doaj.org/article/fb3670e0c71f445eac2a3bcb2362cec9
Description
Summary:After some short test surveys, during the 2004–2005 summer expedition in Antarctica, a geomagnetic French-Italian observatory was installed on the plateau (geographic coordinates: 75.1° S, 123.4° E; corrected geomagnetic coordinates: 88.9° S, 54.3° E; UT=LT−8) very close to the geomagnetic pole. In this paper we present some peculiarities of the daily variation as observed at this polar cap observatory during the years 2005 and 2006, taking into account the different Loyd seasons and different interplanetary magnetic field conditions. Some interesting results emerge from the analysis, confirming the dependence of the daily variation (and of the associated polar current systems) on the IMF B z and B y components. In particular the analysis showed that different B z conditions correspond to different contribution to daily variation of ionospheric and field aligned currents, while particular B y conditions lead to a time shift of the diurnal variation, indicating an asymmetry with respect to the noon meridian.

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