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| Titel |
Mid-latitude solar eclipses and their influence on ionospheric current systems |
| VerfasserIn |
A. T. Tomás, H. Lühr, M. Rother |
| 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 ; 27, no. 12 ; Nr. 27, no. 12 (2009-12-08), S.4449-4461 |
| Datensatznummer |
250016723
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4449-2009.pdf |
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| Zusammenfassung |
| Using CHAMP magnetic field data we study the behaviour of the geomagnetic
field during two mid latitude eclipses on 21 June 2001 and 22 September 2006.
The possible influence of the eclipses on different ionospheric current
systems, as seen in the magnetic field measured by CHAMP, is discussed. It is
expected that the blocking of solar radiation during an eclipse causes a
reduction of the ionospheric conductivity and therefore has an effect on the
different current systems. We address in particular the effects of the
eclipses on the inter-hemispheric field-aligned currents and on the Sq
current system. The two events studied occur under different seasonal
conditions, e.g. June solstice and September equinox, therefore quite
different aspects can be investigated. We find that the eclipses might affect
the direction and intensity of the inter-hemispheric currents and possibly
influence the direction of zonal winds, therefore changing the direction of
the prevailing F-region dynamo currents. The eclipse in the Southern
Hemisphere during September equinox caused inter-hemispheric currents similar
to those observed in northern summer. Reverse inter-hemispheric currents were
recorded after the end of the eclipse. A large variety of atypical currents
was observed during the June event. Most of them might be related to a
reversed F-region dynamo in the morning sector and an enhanced conductivity
difference between the hemispheres. The eclipse in the south seems to enhance
the June solstice conditions considerably. |
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