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| Titel |
Concerning long-term geomagnetic variations and space climatology |
| VerfasserIn |
K.-H. Glassmeier, J. Vogt, A. Stadelmann, S. Buchert |
| 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 ; 22, no. 10 ; Nr. 22, no. 10 (2004-11-03), S.3669-3677 |
| Datensatznummer |
250015039
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3669-2004.pdf |
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| Zusammenfassung |
| During geomagnetic polarity transitions the surface magnetic field
of the Earth decays to about 25% and less of its present value.
This implies a shrinking of the terrestrial magnetosphere and
posses the question of whether magnetospheric magnetic field
variations scale in the same manner. Furthermore, the geomagnetic
main field also controls the magnetospheric magnetic field and
space weather conditions. Long-term geomagnetic variations are
thus intimately related to space climate. We critically assess
existing scaling relations and derive new ones for various
magnetospheric parameters. For example, we find that ring current
perturbations do not increase with decreasing dipole moment. And
we derive a scaling relation for the polar electrojet contribution,
indicating a weak increase with increasing internal field. From
this we infer that the ratio between external and internal field
contributions may be weakly enhanced during polarity transitions.
Our scaling relations also provide more insight on the importance
of the internal geomagnetic field contribution for space climate. |
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