Geomagnetic activity and wind velocity during the Maunder minimum
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Geomagnetic activity and wind velocity during the Maunder minimum
Following a given classi®cation of geomagnetic activity, we obtained aa index values for the Maunder minimum (1645±1715). It is found that the recurrent and ̄uctuating 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 from 1657 to 1700 and 218.7 ...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 1997
ISSN: 1432-0576
DOI: 10.1007/s00585-997-0397-3