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| Titel |
Daily variation at three Antarctic geomagnetic observatories within the polar cap |
| VerfasserIn |
M. Pietrolungo, S. Lepidi, L. Cafarella, L. Santarelli, D. Mauro |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 8 ; Nr. 26, no. 8 (2008-08-04), S.2179-2190 |
| Datensatznummer |
250016177
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2179-2008.pdf |
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| Zusammenfassung |
| In this work we present a statistical analysis of the diurnal variation as
observed at three Antarctic observatories located at different positions
within the polar cap during the year 2006. Data used for the analysis are
from the Italian geomagnetic observatory at Mario Zucchelli Station
(formerly Terra Nova Bay, geographic latitude 74.7° S, corrected
geomagnetic latitude 80.0° S), from the French-Italian observatory at
Concordia Station (75.1° S, 88.9° S) and from the French observatory
at Dumont D'Urville (66.7° S, 80.4° S), which are located in pairs
at the same geographic and corrected geomagnetic latitude; such a position
allows to distinguish whether the geographic or the geomagnetic reference
system is better suitable to describe the observed phenomena at so high
latitudes. The peculiarities of the daily variation as observed during this
year and its relation with the observatory location and magnetospheric and
interplanetary conditions were analysed. Data were also studied taking into
account different Lloyd seasons. The results indicate that the 24-h
variation is quite persistent, but its amplitude strongly depends on season
and global geomagnetic activity: indeed, it almost vanishes during local
winter for quiet geomagnetic conditions; this reduction is more evident at
the stations closer to the geographic pole, where the solar radiation
reduction during winter is more dramatic. The Interplanetary Magnetic Field
orientation has been found to be important in that the north-south and the
east-west components control the amplitude and the diurnal pattern of the
variation, respectively. |
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