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| Titel |
On the semiannual and annual variations of geomagnetic activity and components |
| VerfasserIn |
J.-L. Mouël, E. Blanter, A. Chulliat, M. Shnirman |
| 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.3583-3588 |
| Datensatznummer |
250015033
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3583-2004.pdf |
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| Zusammenfassung |
| The semiannual and annual lines in a long series of magnetic
observatories daily values, as well as in the aa-activity index
series, are investigated. For both periods, amplitudes and phases of
the lines corresponding to the different series present grossly common
variations on decadal time scales; relative phases and amplitude
ratios between the observatories change with the same time
constants. The results are briefly discussed with regards to commonly
received theories of the semiannual variation of magnetic activity,
and some possible mechanisms for the observed geographical variability
are suggested. |
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