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| Titel |
Seasonal and interplanetary magnetic field dependence of the field-aligned currents for both Northern and Southern Hemispheres |
| VerfasserIn |
D. L. Green, C. L. Waters, B. J. Anderson, H. Korth |
| 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. 4 ; Nr. 27, no. 4 (2009-04-08), S.1701-1715 |
| Datensatznummer |
250016493
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1701-2009.pdf |
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| Zusammenfassung |
| The configuration of the Earth's magnetosphere under various Interplanetary
Magnetic Field (IMF) and solar wind conditions alters the global distribution
of Field-Aligned Currents (FACs) at the high latitude ionospheres. We use
magnetic field data obtained from the Iridium constellation to extend recent
studies that infer the dependence of the global FAC configuration on IMF
direction and magnitude, hemisphere and season. New results are a reduced IMF
By influence on the FAC configuration for the winter hemisphere
and a redistribution of FAC to the nightside for winter relative to the
summer hemisphere. These effects are linked to the winter ionosphere
conductance distribution being dominated by localised nightside enhancement
associated with ionisation from energetic particle precipitation. A
comparison of an estimated open-closed field line boundary (OCFLB) with the
Region 1 FAC locations shows reasonable agreement for summer FAC
configurations. However, the OCFLB location is decoupled from the Region 1
FACs in winter, especially for IMF Bz>0. |
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