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| Titel |
Seasonal variations in the occurrence of geomagnetic storms |
| VerfasserIn |
John R. Taylor, Mark Lester, Timothy K. Yeoman |
| 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 ; 14, no. 3 ; Nr. 14, no. 3, S.286-289 |
| Datensatznummer |
250012207
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| Publikation (Nr.) |
 copernicus.org/angeo-14-286-1996.pdf |
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| Zusammenfassung |
| Seasonal variations in the onset of magnetic
storms are investigated. For the purposes of this study storms have been defined
as events in which Dst falls below –50 nT for at least four consecutive
hours. The storms have been classified as either storm sudden commencements (SSCs;
storms initiated by a sudden commencement) or as storm gradual commencements (SGCs;
all other storms). It is found that the semi-annual variation of magnetic
activity is reflected in the occurrence statistics of SGC events only,
indicative that the solar wind origin is different for SSCs and SGCs. It is
suggested that the heliospheric latitude model of seasonal magnetic activity is
relatively ineffective in modulating the previously observed seasonal variations
in the occurrence of magnetic storms. |
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