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| Titel |
Geomagnetic activity and wind velocity during the Maunder minimum |
| VerfasserIn |
B. Mendoza |
| 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 ; 15, no. 4 ; Nr. 15, no. 4, S.397-402 |
| Datensatznummer |
250012725
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| Publikation (Nr.) |
 copernicus.org/angeo-15-397-1997.pdf |
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| Zusammenfassung |
| Following a given classification of
geomagnetic activity, we obtained aa index values for the Maunder minimum
(1645–1715). It is found that the recurrent and fluctuating activities were not
appreciable and that the shock activity levels were very low. The aa
index level was due almost entirely to the quiet days. Calculated average
solar-wind velocities were 194.3 km s–1 from 1657 to 1700 and 218.7
km s–1 from 1700 onwards. Also, the coronal magnetic field magnitude
and southward interplanetary magnetic field component Bz were lower. It
is concluded that the nearly absent levels of geomagnetic activity during this
period were due to lower coronal and Bz magnetic field magnitudes as well
as to the continuous impinging on the Earth of a slow wind. |
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