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| Titel |
Long-term variations in the geomagnetic activity level Part II: Ascending phases of sunspot cycles |
| VerfasserIn |
V. Mussino, O. Borello Filisetti, M. Storini, H. Nevanlinna |
| 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 ; 12, no. 10/11 ; Nr. 12, no. 10/11, S.1065-1070 |
| Datensatznummer |
250010344
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| Publikation (Nr.) |
 copernicus.org/angeo-12-1065-1994.pdf |
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| Zusammenfassung |
| Monthly averages of the Helsinki Ak-values
have been reduced to the equivalent aa-indices to extend the aa-data set back to
1844. A periodicity of about five cycles was found for the correlation
coefficient (r) between geomagnetic indices and sunspot numbers for the
ascending phases of sunspot cycles 9 to 22, confirming previous findings based
on a minor number of sunspot cycles. The result is useful to researchers in
topics related to solar-terrestrial physics, particularly for the interpretation
of long-term trends in geomagnetic activity during the past, and to forecast
geomagnetic activity levels in the future. |
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